517909 divided by 20 
We want to figure out the number of times 517909 can be divided by 20.

Moving on to step 1:
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: 0.0
If we take 0 away from 5, we end up with 5.
Include the next digit (1) from the dividend after 5, then repeat: 51 / 20

Advancing to step 2:
The number 20 fits into 51 2 times, leaving a remainder of 11.
Use 2 as the next digit of our solution. 
Result so far: 2.0
If we take 40 away from 51, we end up with 11.
Fetch the next digit (7) from the dividend, attach it to 11 and continue: 117 / 20

Moving on to step 3:
20 can be fit into 117 5 times, resulting in a remainder of 17.
The next digit of our result is 5. 
Result so far: 25.0
Deduct 100 from 117 and we're left with 17.
Grab the next digit (9) from the dividend, add it to 17, then carry on: 179 / 20

Advancing to step 4:
If we divide 179 by 20, we get 8 and a remainder of 19.
Record the quotient 8 as the next digit in the result. 
Result so far: 258.0
If we take 160 away from 179, we end up with 19.
Include the next digit (0) from the dividend after 19, then repeat: 190 / 20

Step 5:
The number 20 fits into 190 9 times, leaving a remainder of 10.
The next digit of our result is 9. 
Result so far: 2589.0
If we take 180 away from 190, we end up with 10.
Include the next digit (9) from the dividend after 10, then repeat: 109 / 20

Going ahead to step 6:
When dividing 109 by 20, we get 5 with a remainder of 9.
Record the quotient 5 as the next digit in the result. 
Result so far: 25895.0
If we take 100 away from 109, we end up 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.

Let's proceed to step 7:
If we divide 90 by 20, we get 4 and a remainder of 10.
Use 4 as the next digit of our solution. 
Result so far: 25895.4
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.

Advancing to step 8:
20 goes into 100 5 times with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 25895.45
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.

Advancing to step 9:
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: 25895.45
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:
The number 20 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 25895.45
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 final outcome is 25895.45, with a leftover of 0.0.