We're dividing 405518 by 20 
Let's see how many times 20 fits into 405518.

Advancing to step 1:
20 can be fit into 4 0 times, resulting in a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Include the next digit (0) from the dividend after 4, then repeat: 40 / 20

Advancing to step 2:
If we divide 40 by 20, we get 2 and a remainder of 0.
Write down 2 as next digit of the result. 
Result so far: 2.0
If we subtract 40 from 40, we get 0.
Take the next digit (5) from the dividend and append it to 0, then repeat: 5 / 20

On to step 3:
If we divide 5 by 20, we get 0 and a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 20.0
Subtract 0 from 5 to get 5.
Take the next digit (5) from the dividend and append it to 5, then repeat: 55 / 20

Advancing to step 4:
If we divide 55 by 20, we get 2 and a remainder of 15.
Use 2 as the next digit of our solution. 
Result so far: 202.0
Subtract 40 from 55 to get 15.
Take the next digit (1) from the dividend and append it to 15, then repeat: 151 / 20

Step 5:
20 goes into 151 7 times with a remainder of 11.
Write down 7 as next digit of the result. 
Result so far: 2027.0
If we take 140 away from 151, we end up with 11.
Include the next digit (8) from the dividend after 11, then repeat: 118 / 20

On to step 6:
118 divided by 20 is 5 with a remainder of 18.
The next digit of our result is 5. 
Result so far: 20275.0
Deduct 100 from 118 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 7:
180 divided by 20 is 9 with a remainder of 0.
Use 9 as the next digit of our solution. 
Result so far: 20275.9
Subtract 180 from 180 to 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.

On to step 8:
When dividing 0 by 20, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 20275.9
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.

Moving on to step 9:
When dividing 0 by 20, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 20275.9
Subtract 0 from 0 to 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 20275.9, and the remainder is 0.0.