407999 divided by 20 
Our goal is to divide 407999 by 20.

On to step 1:
4 divided by 20 is 0 with a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Bring next digit (0) of the dividend behind the 4 and repeat the process: 40 / 20

Advancing to step 2:
40 divided by 20 is 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 (7) from the dividend after 0, then repeat: 7 / 20

Advancing to step 3:
20 goes into 7 0 times with a remainder of 7.
The next digit of our result is 0. 
Result so far: 20.0
Subtract 0 from 7 to get 7.
Bring next digit (9) of the dividend behind the 7 and repeat the process: 79 / 20

Let's proceed to step 4:
20 can be fit into 79 3 times, resulting in a remainder of 19.
Put 3 as the next digit of the answer. 
Result so far: 203.0
Deduct 60 from 79 and we're left with 19.
Fetch the next digit (9) from the dividend, attach it to 19 and continue: 199 / 20

Going ahead to step 5:
20 can be fit into 199 9 times, resulting in a remainder of 19.
The next digit of our result is 9. 
Result so far: 2039.0
If we subtract 180 from 199, we get 19.
Bring next digit (9) of the dividend behind the 19 and repeat the process: 199 / 20

On to step 6:
20 goes into 199 9 times with a remainder of 19.
Write down 9 as next digit of the result. 
Result so far: 20399.0
Deduct 180 from 199 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.
Put 9 as the next digit of the answer. 
Result so far: 20399.9
The remainder is 10 after subtracting 180 from 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 8:
If we divide 100 by 20, we get 5 and a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 20399.95
Deduct 100 from 100 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.

Moving on to step 9:
0 divided by 20 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 20399.95
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.

Let's proceed to step 10:
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: 20399.95
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.

Our division results in 20399.95 with a remaining 0.0.