We look at the division of 20517143 by 18 
We're looking to find how many times 18 goes into 20517143.

Let's proceed to step 1:
18 goes into 2 0 times with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Grab the next digit (0) from the dividend, add it to 2, then carry on: 20 / 18

Step 2:
If we divide 20 by 18, we get 1 and a remainder of 2.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 18 away from 20, we end up with 2.
Take the next digit (5) from the dividend and append it to 2, then repeat: 25 / 18

Advancing to step 3:
If we divide 25 by 18, we get 1 and a remainder of 7.
Record the quotient 1 as the next digit in the result. 
Result so far: 11.0
If we subtract 18 from 25, we get 7.
Take the next digit (1) from the dividend and append it to 7, then repeat: 71 / 18

Step 4:
When dividing 71 by 18, we get 3 with a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 113.0
The remainder is 17 after subtracting 54 from 71.
Fetch the next digit (7) from the dividend, attach it to 17 and continue: 177 / 18

Going ahead to step 5:
18 can be fit into 177 9 times, resulting in a remainder of 15.
Put 9 as the next digit of the answer. 
Result so far: 1139.0
Subtracting 162 from 177 leaves us with 15.
Append the next digit (1) from the dividend to 15 and continue with: 151 / 18

Moving on to step 6:
The number 18 fits into 151 8 times, leaving a remainder of 7.
Put 8 as the next digit of the answer. 
Result so far: 11398.0
If we subtract 144 from 151, we get 7.
Take the next digit (4) from the dividend and append it to 7, then repeat: 74 / 18

On to step 7:
18 goes into 74 4 times with a remainder of 2.
Use 4 as the next digit of our solution. 
Result so far: 113984.0
Subtract 72 from 74 to get 2.
Append the next digit (3) from the dividend to 2 and continue with: 23 / 18

Moving on to step 8:
18 goes into 23 1 times with a remainder of 5.
The next digit of our result is 1. 
Result so far: 1139841.0
If we subtract 18 from 23, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 9:
When dividing 50 by 18, we get 2 with a remainder of 14.
The number 2 becomes the next digit in our result. 
Result so far: 1139841.2
The remainder is 14 after subtracting 36 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Advancing to step 10:
When dividing 140 by 18, we get 7 with a remainder of 14.
The next digit of our result is 7. 
Result so far: 1139841.27
If we take 126 away from 140, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Step 11:
140 divided by 18 is 7 with a remainder of 14.
Write down 7 as next digit of the result. 
Result so far: 1139841.277
The remainder is 14 after subtracting 126 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

After the division, we end up with 1139841.277 and a remainder of 0.0014.