We're dividing 850039 by 20 
We want to divide 850039 by 20.

Advancing to step 1:
When dividing 8 by 20, we get 0 with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Fetch the next digit (5) from the dividend, attach it to 8 and continue: 85 / 20

On to step 2:
The number 20 fits into 85 4 times, leaving a remainder of 5.
Write down 4 as next digit of the result. 
Result so far: 4.0
If we subtract 80 from 85, we get 5.
Grab the next digit (0) from the dividend, add it to 5, then carry on: 50 / 20

Advancing to step 3:
20 can be fit into 50 2 times, resulting in a remainder of 10.
The next digit of our result is 2. 
Result so far: 42.0
Subtract 40 from 50 to get 10.
Bring next digit (0) of the dividend behind the 10 and repeat the process: 100 / 20

Going ahead to step 4:
20 goes into 100 5 times with a remainder of 0.
The next digit of our result is 5. 
Result so far: 425.0
Subtract 100 from 100 to get 0.
Append the next digit (3) from the dividend to 0 and continue with: 3 / 20

Moving on to step 5:
3 divided by 20 is 0 with a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 4250.0
Subtracting 0 from 3 leaves us with 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 20

Moving on to step 6:
The number 20 fits into 39 1 times, leaving a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 42501.0
Deduct 20 from 39 and we're left with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 7:
20 goes into 190 9 times with a remainder of 10.
Use 9 as the next digit of our solution. 
Result so far: 42501.9
If we take 180 away from 190, we end up 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.

On to step 8:
20 can be fit into 100 5 times, resulting in a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 42501.95
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.

Advancing to step 9:
The number 20 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 42501.95
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.

Step 10:
0 divided by 20 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 42501.95
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.

The final outcome is 42501.95, with a leftover of 0.0.