21303436 ÷ 20 
Our goal is to divide 21303436 by 20.

Step 1:
2 divided by 20 is 0 with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 20

Advancing to step 2:
The number 20 fits into 21 1 times, leaving a remainder of 1.
The next digit of our result is 1. 
Result so far: 1.0
If we take 20 away from 21, we end up with 1.
Bring next digit (3) of the dividend behind the 1 and repeat the process: 13 / 20

Advancing to step 3:
20 goes into 13 0 times with a remainder of 13.
Write down 0 as next digit of the result. 
Result so far: 10.0
If we subtract 0 from 13, we get 13.
Take the next digit (0) from the dividend and append it to 13, then repeat: 130 / 20

Advancing to step 4:
20 can be fit into 130 6 times, resulting in a remainder of 10.
The next digit of our result is 6. 
Result so far: 106.0
If we subtract 120 from 130, we get 10.
Include the next digit (3) from the dividend after 10, then repeat: 103 / 20

Going ahead to step 5:
20 can be fit into 103 5 times, resulting in a remainder of 3.
The number 5 becomes the next digit in our result. 
Result so far: 1065.0
Deduct 100 from 103 and we're left with 3.
Append the next digit (4) from the dividend to 3 and continue with: 34 / 20

Moving on to step 6:
If we divide 34 by 20, we get 1 and a remainder of 14.
Put 1 as the next digit of the answer. 
Result so far: 10651.0
Subtract 20 from 34 to get 14.
Fetch the next digit (3) from the dividend, attach it to 14 and continue: 143 / 20

Let's proceed to step 7:
When dividing 143 by 20, we get 7 with a remainder of 3.
Write down 7 as next digit of the result. 
Result so far: 106517.0
The remainder is 3 after subtracting 140 from 143.
Fetch the next digit (6) from the dividend, attach it to 3 and continue: 36 / 20

Let's proceed to step 8:
If we divide 36 by 20, we get 1 and a remainder of 16.
Record the quotient 1 as the next digit in the result. 
Result so far: 1065171.0
If we subtract 20 from 36, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Step 9:
The number 20 fits into 160 8 times, leaving a remainder of 0.
Put 8 as the next digit of the answer. 
Result so far: 1065171.8
If we subtract 160 from 160, 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.

On to step 10:
20 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 1065171.8
Subtract 0 from 0 to 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.

On to step 11:
0 divided by 20 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 1065171.8
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 1065171.8 and a remainder of 0.0.