518866 ÷ 20 
We want to divide 518866 by 20.

Going ahead to step 1:
When dividing 5 by 20, we get 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Take the next digit (1) from the dividend and append it to 5, then repeat: 51 / 20

On to step 2:
20 can be fit into 51 2 times, resulting in a remainder of 11.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Deduct 40 from 51 and we're left with 11.
Include the next digit (8) from the dividend after 11, then repeat: 118 / 20

Going ahead to step 3:
If we divide 118 by 20, we get 5 and a remainder of 18.
Record the quotient 5 as the next digit in the result. 
Result so far: 25.0
Deduct 100 from 118 and we're left with 18.
Take the next digit (8) from the dividend and append it to 18, then repeat: 188 / 20

Moving on to step 4:
20 goes into 188 9 times with a remainder of 8.
Write down 9 as next digit of the result. 
Result so far: 259.0
Deduct 180 from 188 and we're left with 8.
Take the next digit (6) from the dividend and append it to 8, then repeat: 86 / 20

Step 5:
20 can be fit into 86 4 times, resulting in a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 2594.0
If we take 80 away from 86, we end up with 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 20

Step 6:
66 divided by 20 is 3 with a remainder of 6.
Write down 3 as next digit of the result. 
Result so far: 25943.0
Subtracting 60 from 66 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 7:
When dividing 60 by 20, we get 3 with a remainder of 0.
Use 3 as the next digit of our solution. 
Result so far: 25943.3
If we take 60 away from 60, 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.

Advancing to step 8:
20 goes into 0 0 times with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 25943.3
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.

Step 9:
The number 20 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 25943.3
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.

After the division, we end up with 25943.3 and a remainder of 0.0.