We're dividing 415440 by 20 
We want to divide 415440 by 20.

Let's proceed to step 1:
4 divided by 20 is 0 with a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Include the next digit (1) from the dividend after 4, then repeat: 41 / 20

Going ahead to step 2:
41 divided by 20 is 2 with a remainder of 1.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we subtract 40 from 41, we get 1.
Take the next digit (5) from the dividend and append it to 1, then repeat: 15 / 20

Step 3:
If we divide 15 by 20, we get 0 and a remainder of 15.
Record the quotient 0 as the next digit in the result. 
Result so far: 20.0
The remainder is 15 after subtracting 0 from 15.
Include the next digit (4) from the dividend after 15, then repeat: 154 / 20

Let's proceed to step 4:
154 divided by 20 is 7 with a remainder of 14.
Put 7 as the next digit of the answer. 
Result so far: 207.0
If we take 140 away from 154, we end up with 14.
Take the next digit (4) from the dividend and append it to 14, then repeat: 144 / 20

Let's proceed to step 5:
If we divide 144 by 20, we get 7 and a remainder of 4.
Record the quotient 7 as the next digit in the result. 
Result so far: 2077.0
Deduct 140 from 144 and we're left with 4.
Grab the next digit (0) from the dividend, add it to 4, then carry on: 40 / 20

Advancing to step 6:
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: 20772.0
Subtract 40 from 40 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.

Going ahead to step 7:
20 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 20772.0
If we take 0 away from 0, 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.

On to step 8:
0 divided by 20 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 20772.0
If we take 0 away from 0, 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.

In conclusion, the division gives 20772.0 with a balance of 0.0.