We're dividing 53173709 by 20 
We're looking to find how many times 20 goes into 53173709.

Going ahead to step 1:
20 goes into 5 0 times with a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Fetch the next digit (3) from the dividend, attach it to 5 and continue: 53 / 20

Going ahead to step 2:
53 divided by 20 is 2 with a remainder of 13.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtracting 40 from 53 leaves us with 13.
Take the next digit (1) from the dividend and append it to 13, then repeat: 131 / 20

Step 3:
131 divided by 20 is 6 with a remainder of 11.
Write down 6 as next digit of the result. 
Result so far: 26.0
The remainder is 11 after subtracting 120 from 131.
Include the next digit (7) from the dividend after 11, then repeat: 117 / 20

Advancing to step 4:
When dividing 117 by 20, we get 5 with a remainder of 17.
The number 5 becomes the next digit in our result. 
Result so far: 265.0
Deduct 100 from 117 and we're left with 17.
Append the next digit (3) from the dividend to 17 and continue with: 173 / 20

Let's proceed to step 5:
173 divided by 20 is 8 with a remainder of 13.
The next digit of our result is 8. 
Result so far: 2658.0
Deduct 160 from 173 and we're left with 13.
Take the next digit (7) from the dividend and append it to 13, then repeat: 137 / 20

Advancing to step 6:
If we divide 137 by 20, we get 6 and a remainder of 17.
Use 6 as the next digit of our solution. 
Result so far: 26586.0
The remainder is 17 after subtracting 120 from 137.
Take the next digit (0) from the dividend and append it to 17, then repeat: 170 / 20

Advancing to step 7:
If we divide 170 by 20, we get 8 and a remainder of 10.
The number 8 becomes the next digit in our result. 
Result so far: 265868.0
Deduct 160 from 170 and we're left with 10.
Append the next digit (9) from the dividend to 10 and continue with: 109 / 20

Step 8:
If we divide 109 by 20, we get 5 and a remainder of 9.
The next digit of our result is 5. 
Result so far: 2658685.0
Subtract 100 from 109 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 9:
When dividing 90 by 20, we get 4 with a remainder of 10.
The next digit of our result is 4. 
Result so far: 2658685.4
Deduct 80 from 90 and we're left with 10.
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 10:
The number 20 fits into 100 5 times, leaving a remainder of 0.
The next digit of our result is 5. 
Result so far: 2658685.45
Subtract 100 from 100 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.

Step 11:
20 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 2658685.45
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.

Going ahead to step 12:
If we divide 0 by 20, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 2658685.45
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.

The final result is 2658685.45 with a remainder of 0.0.