20125853 ÷ 807 
Let's see how many times 807 fits into 20125853.

Moving on to step 1:
807 goes into 2 0 times with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Grab the next digit (0) from the dividend, add it to 2, then carry on: 20 / 807

Step 2:
807 can be fit into 20 0 times, resulting in a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 20 to get 20.
Include the next digit (1) from the dividend after 20, then repeat: 201 / 807

Advancing to step 3:
The number 807 fits into 201 0 times, leaving a remainder of 201.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 201 leaves us with 201.
Grab the next digit (2) from the dividend, add it to 201, then carry on: 2012 / 807

Moving on to step 4:
The number 807 fits into 2012 2 times, leaving a remainder of 398.
The next digit of our result is 2. 
Result so far: 2.0
If we subtract 1614 from 2012, we get 398.
Append the next digit (5) from the dividend to 398 and continue with: 3985 / 807

Moving on to step 5:
If we divide 3985 by 807, we get 4 and a remainder of 757.
Record the quotient 4 as the next digit in the result. 
Result so far: 24.0
Deduct 3228 from 3985 and we're left with 757.
Take the next digit (8) from the dividend and append it to 757, then repeat: 7578 / 807

Moving on to step 6:
807 goes into 7578 9 times with a remainder of 315.
Record the quotient 9 as the next digit in the result. 
Result so far: 249.0
Subtracting 7263 from 7578 leaves us with 315.
Fetch the next digit (5) from the dividend, attach it to 315 and continue: 3155 / 807

Moving on to step 7:
The number 807 fits into 3155 3 times, leaving a remainder of 734.
The number 3 becomes the next digit in our result. 
Result so far: 2493.0
The remainder is 734 after subtracting 2421 from 3155.
Grab the next digit (3) from the dividend, add it to 734, then carry on: 7343 / 807

On to step 8:
807 can be fit into 7343 9 times, resulting in a remainder of 80.
Put 9 as the next digit of the answer. 
Result so far: 24939.0
The remainder is 80 after subtracting 7263 from 7343.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Let's proceed to step 9:
When dividing 800 by 807, we get 0 with a remainder of 800.
Put 0 as the next digit of the answer. 
Result so far: 24939.0
If we take 0 away from 800, we end up with 800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8000, and continue the process.

Going ahead to step 10:
8000 divided by 807 is 9 with a remainder of 737.
Write down 9 as next digit of the result. 
Result so far: 24939.09
Subtract 7263 from 8000 to get 737.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7370, and continue the process.

Advancing to step 11:
807 goes into 7370 9 times with a remainder of 107.
The number 9 becomes the next digit in our result. 
Result so far: 24939.099
Subtract 7263 from 7370 to get 107.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1070, and continue the process.

The final result is 24939.099 with a remainder of 0.0107.