We look at the division of 91620591 by 20 
Let's see how many times 20 fits into 91620591.

Moving on to step 1:
20 goes into 9 0 times with a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Grab the next digit (1) from the dividend, add it to 9, then carry on: 91 / 20

On to step 2:
If we divide 91 by 20, we get 4 and a remainder of 11.
Write down 4 as next digit of the result. 
Result so far: 4.0
If we subtract 80 from 91, we get 11.
Append the next digit (6) from the dividend to 11 and continue with: 116 / 20

Let's proceed to step 3:
116 divided by 20 is 5 with a remainder of 16.
Write down 5 as next digit of the result. 
Result so far: 45.0
If we take 100 away from 116, we end up with 16.
Fetch the next digit (2) from the dividend, attach it to 16 and continue: 162 / 20

Advancing to step 4:
162 divided by 20 is 8 with a remainder of 2.
The number 8 becomes the next digit in our result. 
Result so far: 458.0
Subtract 160 from 162 to get 2.
Include the next digit (0) from the dividend after 2, then repeat: 20 / 20

Let's proceed to step 5:
20 divided by 20 is 1 with a remainder of 0.
The next digit of our result is 1. 
Result so far: 4581.0
Subtracting 20 from 20 leaves us with 0.
Take the next digit (5) from the dividend and append it to 0, then repeat: 5 / 20

Step 6:
20 can be fit into 5 0 times, resulting in a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 45810.0
Subtracting 0 from 5 leaves us with 5.
Take the next digit (9) from the dividend and append it to 5, then repeat: 59 / 20

Step 7:
20 goes into 59 2 times with a remainder of 19.
Use 2 as the next digit of our solution. 
Result so far: 458102.0
Subtracting 40 from 59 leaves us with 19.
Bring next digit (1) of the dividend behind the 19 and repeat the process: 191 / 20

On to step 8:
The number 20 fits into 191 9 times, leaving a remainder of 11.
The next digit of our result is 9. 
Result so far: 4581029.0
Subtract 180 from 191 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 9:
20 goes into 110 5 times with a remainder of 10.
Use 5 as the next digit of our solution. 
Result so far: 4581029.5
If we subtract 100 from 110, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 10:
If we divide 100 by 20, we get 5 and a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 4581029.55
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.

The quotient of the division is 4581029.55, and the remainder is 0.0.