45171 divided by 20 
We want to figure out the number of times 45171 can be divided by 20.

Let's proceed to step 1:
When dividing 4 by 20, we get 0 with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Fetch the next digit (5) from the dividend, attach it to 4 and continue: 45 / 20

Let's proceed to step 2:
20 can be fit into 45 2 times, resulting in a remainder of 5.
The next digit of our result is 2. 
Result so far: 2.0
Subtract 40 from 45 to get 5.
Fetch the next digit (1) from the dividend, attach it to 5 and continue: 51 / 20

On to step 3:
51 divided by 20 is 2 with a remainder of 11.
The next digit of our result is 2. 
Result so far: 22.0
Subtract 40 from 51 to get 11.
Include the next digit (7) from the dividend after 11, then repeat: 117 / 20

Let's proceed to step 4:
117 divided by 20 is 5 with a remainder of 17.
Use 5 as the next digit of our solution. 
Result so far: 225.0
Subtract 100 from 117 to get 17.
Append the next digit (1) from the dividend to 17 and continue with: 171 / 20

Going ahead to step 5:
The number 20 fits into 171 8 times, leaving a remainder of 11.
Write down 8 as next digit of the result. 
Result so far: 2258.0
Deduct 160 from 171 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Moving on to step 6:
When dividing 110 by 20, we get 5 with a remainder of 10.
Put 5 as the next digit of the answer. 
Result so far: 2258.5
If we subtract 100 from 110, we get 10.
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 7:
When dividing 100 by 20, we get 5 with a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 2258.55
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.

The final outcome is 2258.55, with a leftover of 0.0.