We're dividing 81619720 by 20 
We want to figure out the number of times 81619720 can be divided by 20.

Step 1:
20 can be fit into 8 0 times, resulting in a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 20

On to step 2:
When dividing 81 by 20, we get 4 with a remainder of 1.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
If we subtract 80 from 81, we get 1.
Grab the next digit (6) from the dividend, add it to 1, then carry on: 16 / 20

Going ahead to step 3:
The number 20 fits into 16 0 times, leaving a remainder of 16.
Record the quotient 0 as the next digit in the result. 
Result so far: 40.0
If we subtract 0 from 16, we get 16.
Take the next digit (1) from the dividend and append it to 16, then repeat: 161 / 20

Moving on to step 4:
161 divided by 20 is 8 with a remainder of 1.
Put 8 as the next digit of the answer. 
Result so far: 408.0
The remainder is 1 after subtracting 160 from 161.
Append the next digit (9) from the dividend to 1 and continue with: 19 / 20

Moving on to step 5:
The number 20 fits into 19 0 times, leaving a remainder of 19.
Write down 0 as next digit of the result. 
Result so far: 4080.0
Deduct 0 from 19 and we're left with 19.
Append the next digit (7) from the dividend to 19 and continue with: 197 / 20

Advancing to step 6:
20 can be fit into 197 9 times, resulting in a remainder of 17.
The number 9 becomes the next digit in our result. 
Result so far: 40809.0
Subtracting 180 from 197 leaves us with 17.
Bring next digit (2) of the dividend behind the 17 and repeat the process: 172 / 20

Advancing to step 7:
The number 20 fits into 172 8 times, leaving a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 408098.0
Subtracting 160 from 172 leaves us with 12.
Append the next digit (0) from the dividend to 12 and continue with: 120 / 20

Moving on to step 8:
The number 20 fits into 120 6 times, leaving a remainder of 0.
The number 6 becomes the next digit in our result. 
Result so far: 4080986.0
Deduct 120 from 120 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.

Moving on to step 9:
When dividing 0 by 20, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 4080986.0
If we take 0 away from 0, we end up 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.

Advancing to step 10:
The number 20 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 4080986.0
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.

In conclusion, the division gives 4080986.0 with a balance of 0.0.