451507 divided by 20 
We want to figure out the number of times 451507 can be divided by 20.

Going ahead to step 1:
20 can be fit into 4 0 times, resulting in a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Take the next digit (5) from the dividend and append it to 4, then repeat: 45 / 20

Moving on to step 2:
If we divide 45 by 20, we get 2 and a remainder of 5.
The next digit of our result is 2. 
Result so far: 2.0
The remainder is 5 after subtracting 40 from 45.
Grab the next digit (1) from the dividend, add it to 5, then carry on: 51 / 20

Step 3:
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: 22.0
Subtract 40 from 51 to get 11.
Include the next digit (5) from the dividend after 11, then repeat: 115 / 20

Let's proceed to step 4:
115 divided by 20 is 5 with a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 225.0
Deduct 100 from 115 and we're left with 15.
Bring next digit (0) of the dividend behind the 15 and repeat the process: 150 / 20

Step 5:
If we divide 150 by 20, we get 7 and a remainder of 10.
Put 7 as the next digit of the answer. 
Result so far: 2257.0
If we subtract 140 from 150, we get 10.
Bring next digit (7) of the dividend behind the 10 and repeat the process: 107 / 20

On to step 6:
107 divided by 20 is 5 with a remainder of 7.
Write down 5 as next digit of the result. 
Result so far: 22575.0
Deduct 100 from 107 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Step 7:
When dividing 70 by 20, we get 3 with a remainder of 10.
Record the quotient 3 as the next digit in the result. 
Result so far: 22575.3
The remainder is 10 after subtracting 60 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 8:
20 can be fit into 100 5 times, resulting in a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 22575.35
If we take 100 away from 100, 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.

Let's proceed to step 9:
When dividing 0 by 20, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 22575.35
Subtracting 0 from 0 leaves us 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.

Moving on to step 10:
The number 20 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 22575.35
Subtracting 0 from 0 leaves us 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.

In conclusion, the division gives 22575.35 with a balance of 0.0.