417509 ÷ 20 
We want to divide 417509 by 20.

Let's proceed to step 1:
20 goes into 4 0 times with a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Bring next digit (1) of the dividend behind the 4 and repeat the process: 41 / 20

Going ahead to step 2:
The number 20 fits into 41 2 times, leaving a remainder of 1.
Use 2 as the next digit of our solution. 
Result so far: 2.0
The remainder is 1 after subtracting 40 from 41.
Grab the next digit (7) from the dividend, add it to 1, then carry on: 17 / 20

Let's proceed to step 3:
If we divide 17 by 20, we get 0 and a remainder of 17.
Write down 0 as next digit of the result. 
Result so far: 20.0
Deduct 0 from 17 and we're left with 17.
Grab the next digit (5) from the dividend, add it to 17, then carry on: 175 / 20

Let's proceed to step 4:
20 can be fit into 175 8 times, resulting in a remainder of 15.
The next digit of our result is 8. 
Result so far: 208.0
Deduct 160 from 175 and we're left with 15.
Grab the next digit (0) from the dividend, add it to 15, then carry on: 150 / 20

Let's proceed to step 5:
20 goes into 150 7 times with a remainder of 10.
The number 7 becomes the next digit in our result. 
Result so far: 2087.0
Subtract 140 from 150 to get 10.
Bring next digit (9) of the dividend behind the 10 and repeat the process: 109 / 20

Let's proceed to step 6:
If we divide 109 by 20, we get 5 and a remainder of 9.
The number 5 becomes the next digit in our result. 
Result so far: 20875.0
Subtracting 100 from 109 leaves us with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Moving on to step 7:
20 goes into 90 4 times with a remainder of 10.
Record the quotient 4 as the next digit in the result. 
Result so far: 20875.4
The remainder is 10 after subtracting 80 from 90.
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:
If we divide 100 by 20, we get 5 and a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 20875.45
If we subtract 100 from 100, 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.

Let's proceed to step 9:
20 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 20875.45
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.

Going ahead to step 10:
0 divided by 20 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 20875.45
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.

The final outcome is 20875.45, with a leftover of 0.0.