We're dividing 20399916 by 243 
Let's see how many times 243 fits into 20399916.

Advancing to step 1:
When dividing 2 by 243, we get 0 with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Grab the next digit (0) from the dividend, add it to 2, then carry on: 20 / 243

Going ahead to step 2:
The number 243 fits into 20 0 times, leaving a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 20, we get 20.
Fetch the next digit (3) from the dividend, attach it to 20 and continue: 203 / 243

Moving on to step 3:
The number 243 fits into 203 0 times, leaving a remainder of 203.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 203, we get 203.
Grab the next digit (9) from the dividend, add it to 203, then carry on: 2039 / 243

Moving on to step 4:
2039 divided by 243 is 8 with a remainder of 95.
Put 8 as the next digit of the answer. 
Result so far: 8.0
If we take 1944 away from 2039, we end up with 95.
Fetch the next digit (9) from the dividend, attach it to 95 and continue: 959 / 243

Moving on to step 5:
243 goes into 959 3 times with a remainder of 230.
The number 3 becomes the next digit in our result. 
Result so far: 83.0
If we subtract 729 from 959, we get 230.
Take the next digit (9) from the dividend and append it to 230, then repeat: 2309 / 243

Step 6:
If we divide 2309 by 243, we get 9 and a remainder of 122.
The number 9 becomes the next digit in our result. 
Result so far: 839.0
If we subtract 2187 from 2309, we get 122.
Grab the next digit (1) from the dividend, add it to 122, then carry on: 1221 / 243

Step 7:
243 can be fit into 1221 5 times, resulting in a remainder of 6.
The next digit of our result is 5. 
Result so far: 8395.0
Subtracting 1215 from 1221 leaves us with 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 243

Let's proceed to step 8:
66 divided by 243 is 0 with a remainder of 66.
Put 0 as the next digit of the answer. 
Result so far: 83950.0
The remainder is 66 after subtracting 0 from 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Going ahead to step 9:
The number 243 fits into 660 2 times, leaving a remainder of 174.
Record the quotient 2 as the next digit in the result. 
Result so far: 83950.2
The remainder is 174 after subtracting 486 from 660.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1740, and continue the process.

Let's proceed to step 10:
243 goes into 1740 7 times with a remainder of 39.
Put 7 as the next digit of the answer. 
Result so far: 83950.27
If we take 1701 away from 1740, we end up with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Moving on to step 11:
243 can be fit into 390 1 times, resulting in a remainder of 147.
Put 1 as the next digit of the answer. 
Result so far: 83950.271
Subtract 243 from 390 to get 147.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1470, and continue the process.

Let's proceed to step 12:
If we divide 1470 by 243, we get 6 and a remainder of 12.
Use 6 as the next digit of our solution. 
Result so far: 83950.2716
Subtracting 1458 from 1470 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 13:
The number 243 fits into 120 0 times, leaving a remainder of 120.
The number 0 becomes the next digit in our result. 
Result so far: 83950.2716
Deduct 0 from 120 and we're left with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Advancing to step 14:
The number 243 fits into 1200 4 times, leaving a remainder of 228.
The number 4 becomes the next digit in our result. 
Result so far: 83950.271604
The remainder is 228 after subtracting 972 from 1200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2280, and continue the process.

Let's proceed to step 15:
243 can be fit into 2280 9 times, resulting in a remainder of 93.
Put 9 as the next digit of the answer. 
Result so far: 83950.2716049
Subtracting 2187 from 2280 leaves us with 93.
Since there are no more digits in the dividend, we add a zero to the remainder making it 930, and continue the process.

Moving on to step 16:
243 goes into 930 3 times with a remainder of 201.
Use 3 as the next digit of our solution. 
Result so far: 83950.27160493
Deduct 729 from 930 and we're left with 201.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2010, and continue the process.

The final outcome is 83950.27160493, with a leftover of 2.01e-07.