We're dividing 78213798 by 20 
Let's see how many times 20 fits into 78213798.

Going ahead to step 1:
7 divided by 20 is 0 with a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Include the next digit (8) from the dividend after 7, then repeat: 78 / 20

Let's proceed to step 2:
78 divided by 20 is 3 with a remainder of 18.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
The remainder is 18 after subtracting 60 from 78.
Include the next digit (2) from the dividend after 18, then repeat: 182 / 20

Step 3:
The number 20 fits into 182 9 times, leaving a remainder of 2.
Record the quotient 9 as the next digit in the result. 
Result so far: 39.0
If we take 180 away from 182, we end up with 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 20

Let's proceed to step 4:
The number 20 fits into 21 1 times, leaving a remainder of 1.
Put 1 as the next digit of the answer. 
Result so far: 391.0
Subtract 20 from 21 to get 1.
Grab the next digit (3) from the dividend, add it to 1, then carry on: 13 / 20

On to step 5:
When dividing 13 by 20, we get 0 with a remainder of 13.
Use 0 as the next digit of our solution. 
Result so far: 3910.0
If we take 0 away from 13, we end up with 13.
Fetch the next digit (7) from the dividend, attach it to 13 and continue: 137 / 20

Moving on to step 6:
If we divide 137 by 20, we get 6 and a remainder of 17.
The number 6 becomes the next digit in our result. 
Result so far: 39106.0
The remainder is 17 after subtracting 120 from 137.
Grab the next digit (9) from the dividend, add it to 17, then carry on: 179 / 20

Let's proceed to step 7:
When dividing 179 by 20, we get 8 with a remainder of 19.
Write down 8 as next digit of the result. 
Result so far: 391068.0
If we subtract 160 from 179, we get 19.
Include the next digit (8) from the dividend after 19, then repeat: 198 / 20

On to step 8:
198 divided by 20 is 9 with a remainder of 18.
Record the quotient 9 as the next digit in the result. 
Result so far: 3910689.0
Subtracting 180 from 198 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 9:
20 goes into 180 9 times with a remainder of 0.
Use 9 as the next digit of our solution. 
Result so far: 3910689.9
If we subtract 180 from 180, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 10:
20 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 3910689.9
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 11:
20 can be fit into 0 0 times, resulting in a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 3910689.9
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 3910689.9 with a remainder of 0.0.