We're dividing 401539 by 20 
We want to divide 401539 by 20.

Advancing to step 1:
When dividing 4 by 20, we get 0 with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Grab the next digit (0) from the dividend, add it to 4, then carry on: 40 / 20

Step 2:
When dividing 40 by 20, we get 2 with a remainder of 0.
Use 2 as the next digit of our solution. 
Result so far: 2.0
If we take 40 away from 40, we end up with 0.
Include the next digit (1) from the dividend after 0, then repeat: 1 / 20

Going ahead to step 3:
The number 20 fits into 1 0 times, leaving a remainder of 1.
The next digit of our result is 0. 
Result so far: 20.0
Deduct 0 from 1 and we're left with 1.
Append the next digit (5) from the dividend to 1 and continue with: 15 / 20

Let's proceed to step 4:
20 goes into 15 0 times with a remainder of 15.
The next digit of our result is 0. 
Result so far: 200.0
The remainder is 15 after subtracting 0 from 15.
Include the next digit (3) from the dividend after 15, then repeat: 153 / 20

Step 5:
153 divided by 20 is 7 with a remainder of 13.
Put 7 as the next digit of the answer. 
Result so far: 2007.0
If we subtract 140 from 153, we get 13.
Take the next digit (9) from the dividend and append it to 13, then repeat: 139 / 20

Let's proceed to step 6:
If we divide 139 by 20, we get 6 and a remainder of 19.
Write down 6 as next digit of the result. 
Result so far: 20076.0
Subtract 120 from 139 to get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Advancing to step 7:
20 can be fit into 190 9 times, resulting in a remainder of 10.
The number 9 becomes the next digit in our result. 
Result so far: 20076.9
Subtract 180 from 190 to 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.

Going ahead to step 8:
20 can be fit into 100 5 times, resulting in a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 20076.95
The remainder is 0 after subtracting 100 from 100.
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:
20 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 20076.95
Subtracting 0 from 0 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 10:
20 can be fit into 0 0 times, resulting in a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 20076.95
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 20076.95, with a leftover of 0.0.