We look at the division of 21395675 by 20 
We want to divide 21395675 by 20.

Going ahead to step 1:
20 goes into 2 0 times with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 20

Let's proceed to step 2:
The number 20 fits into 21 1 times, leaving a remainder of 1.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 1 after subtracting 20 from 21.
Append the next digit (3) from the dividend to 1 and continue with: 13 / 20

Moving on to step 3:
13 divided by 20 is 0 with a remainder of 13.
Write down 0 as next digit of the result. 
Result so far: 10.0
If we take 0 away from 13, we end up with 13.
Grab the next digit (9) from the dividend, add it to 13, then carry on: 139 / 20

Going ahead to step 4:
139 divided by 20 is 6 with a remainder of 19.
Use 6 as the next digit of our solution. 
Result so far: 106.0
Deduct 120 from 139 and we're left with 19.
Grab the next digit (5) from the dividend, add it to 19, then carry on: 195 / 20

Going ahead to step 5:
If we divide 195 by 20, we get 9 and a remainder of 15.
The next digit of our result is 9. 
Result so far: 1069.0
Deduct 180 from 195 and we're left with 15.
Grab the next digit (6) from the dividend, add it to 15, then carry on: 156 / 20

On to step 6:
156 divided by 20 is 7 with a remainder of 16.
The number 7 becomes the next digit in our result. 
Result so far: 10697.0
Subtract 140 from 156 to get 16.
Take the next digit (7) from the dividend and append it to 16, then repeat: 167 / 20

Step 7:
If we divide 167 by 20, we get 8 and a remainder of 7.
Write down 8 as next digit of the result. 
Result so far: 106978.0
Deduct 160 from 167 and we're left with 7.
Fetch the next digit (5) from the dividend, attach it to 7 and continue: 75 / 20

On to step 8:
The number 20 fits into 75 3 times, leaving a remainder of 15.
Write down 3 as next digit of the result. 
Result so far: 1069783.0
The remainder is 15 after subtracting 60 from 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 9:
20 can be fit into 150 7 times, resulting in a remainder of 10.
Write down 7 as next digit of the result. 
Result so far: 1069783.7
Subtracting 140 from 150 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 10:
The number 20 fits into 100 5 times, leaving a remainder of 0.
The next digit of our result is 5. 
Result so far: 1069783.75
Subtracting 100 from 100 leaves us 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.

Step 11:
When dividing 0 by 20, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 1069783.75
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.

Going ahead to step 12:
20 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 1069783.75
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 1069783.75 and a remainder of 0.0.