We divide 841991 by 20
We're looking to find how many times 20 goes into 841991.

Step 1:
20 can be fit into 8 0 times, resulting in a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Fetch the next digit (4) from the dividend, attach it to 8 and continue: 84 / 20

On to step 2:
84 divided by 20 is 4 with a remainder of 4.
Use 4 as the next digit of our solution. 
Result so far: 4.0
If we take 80 away from 84, we end up with 4.
Fetch the next digit (1) from the dividend, attach it to 4 and continue: 41 / 20

Going ahead to step 3:
The number 20 fits into 41 2 times, leaving a remainder of 1.
Use 2 as the next digit of our solution. 
Result so far: 42.0
The remainder is 1 after subtracting 40 from 41.
Fetch the next digit (9) from the dividend, attach it to 1 and continue: 19 / 20

Going ahead to step 4:
When dividing 19 by 20, we get 0 with a remainder of 19.
Use 0 as the next digit of our solution. 
Result so far: 420.0
Deduct 0 from 19 and we're left with 19.
Include the next digit (9) from the dividend after 19, then repeat: 199 / 20

Let's proceed to step 5:
If we divide 199 by 20, we get 9 and a remainder of 19.
Record the quotient 9 as the next digit in the result. 
Result so far: 4209.0
If we subtract 180 from 199, we get 19.
Append the next digit (1) from the dividend to 19 and continue with: 191 / 20

On to step 6:
191 divided by 20 is 9 with a remainder of 11.
The next digit of our result is 9. 
Result so far: 42099.0
If we subtract 180 from 191, we 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.

Advancing to step 7:
When dividing 110 by 20, we get 5 with a remainder of 10.
The next digit of our result is 5. 
Result so far: 42099.5
Deduct 100 from 110 and we're left 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 8:
20 can be fit into 100 5 times, resulting in a remainder of 0.
The next digit of our result is 5. 
Result so far: 42099.55
If we take 100 away from 100, 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.

The final result is 42099.55 with a remainder of 0.0.