We're dividing 91439680 by 20 
Our goal is to divide 91439680 by 20.

Let's proceed to step 1:
20 can be fit into 9 0 times, resulting in a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Append the next digit (1) from the dividend to 9 and continue with: 91 / 20

Going ahead to step 2:
When dividing 91 by 20, we get 4 with a remainder of 11.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
If we subtract 80 from 91, we get 11.
Bring next digit (4) of the dividend behind the 11 and repeat the process: 114 / 20

Let's proceed to step 3:
When dividing 114 by 20, we get 5 with a remainder of 14.
Record the quotient 5 as the next digit in the result. 
Result so far: 45.0
Deduct 100 from 114 and we're left with 14.
Bring next digit (3) of the dividend behind the 14 and repeat the process: 143 / 20

On to step 4:
20 goes into 143 7 times with a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 457.0
Subtracting 140 from 143 leaves us with 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 20

On to step 5:
If we divide 39 by 20, we get 1 and a remainder of 19.
Record the quotient 1 as the next digit in the result. 
Result so far: 4571.0
If we subtract 20 from 39, we get 19.
Grab the next digit (6) from the dividend, add it to 19, then carry on: 196 / 20

On to step 6:
The number 20 fits into 196 9 times, leaving a remainder of 16.
The next digit of our result is 9. 
Result so far: 45719.0
The remainder is 16 after subtracting 180 from 196.
Fetch the next digit (8) from the dividend, attach it to 16 and continue: 168 / 20

Advancing to step 7:
If we divide 168 by 20, we get 8 and a remainder of 8.
The number 8 becomes the next digit in our result. 
Result so far: 457198.0
Deduct 160 from 168 and we're left with 8.
Append the next digit (0) from the dividend to 8 and continue with: 80 / 20

On to step 8:
20 goes into 80 4 times with a remainder of 0.
Write down 4 as next digit of the result. 
Result so far: 4571984.0
Subtracting 80 from 80 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.

Advancing to step 9:
0 divided by 20 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 4571984.0
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.

Going ahead to step 10:
0 divided by 20 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 4571984.0
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.

The final outcome is 4571984.0, with a leftover of 0.0.