We're dividing 407958 by 20 
We want to divide 407958 by 20.

Advancing to step 1:
The number 20 fits into 4 0 times, leaving a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Fetch the next digit (0) from the dividend, attach it to 4 and continue: 40 / 20

Let's proceed to step 2:
The number 20 fits into 40 2 times, leaving a remainder of 0.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Deduct 40 from 40 and we're left with 0.
Bring next digit (7) of the dividend behind the 0 and repeat the process: 7 / 20

Going ahead to step 3:
20 can be fit into 7 0 times, resulting in a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 20.0
Subtracting 0 from 7 leaves us with 7.
Fetch the next digit (9) from the dividend, attach it to 7 and continue: 79 / 20

Moving on to step 4:
20 goes into 79 3 times with a remainder of 19.
Write down 3 as next digit of the result. 
Result so far: 203.0
If we subtract 60 from 79, we get 19.
Append the next digit (5) from the dividend to 19 and continue with: 195 / 20

Moving on to step 5:
20 can be fit into 195 9 times, resulting in a remainder of 15.
The next digit of our result is 9. 
Result so far: 2039.0
The remainder is 15 after subtracting 180 from 195.
Bring next digit (8) of the dividend behind the 15 and repeat the process: 158 / 20

Let's proceed to step 6:
If we divide 158 by 20, we get 7 and a remainder of 18.
Record the quotient 7 as the next digit in the result. 
Result so far: 20397.0
Subtract 140 from 158 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Advancing to step 7:
20 goes into 180 9 times with a remainder of 0.
Put 9 as the next digit of the answer. 
Result so far: 20397.9
Deduct 180 from 180 and we're left 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.

On to step 8:
If we divide 0 by 20, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 20397.9
Deduct 0 from 0 and we're left 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.

On to step 9:
The number 20 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 20397.9
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 quotient of the division is 20397.9, and the remainder is 0.0.