18161873 ÷ 903 
We want to figure out the number of times 18161873 can be divided by 903.

Step 1:
903 can be fit into 1 0 times, resulting in a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Grab the next digit (8) from the dividend, add it to 1, then carry on: 18 / 903

On to step 2:
When dividing 18 by 903, we get 0 with a remainder of 18.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 18 and we're left with 18.
Append the next digit (1) from the dividend to 18 and continue with: 181 / 903

On to step 3:
903 goes into 181 0 times with a remainder of 181.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 181 leaves us with 181.
Include the next digit (6) from the dividend after 181, then repeat: 1816 / 903

Step 4:
If we divide 1816 by 903, we get 2 and a remainder of 10.
Write down 2 as next digit of the result. 
Result so far: 2.0
If we take 1806 away from 1816, we end up with 10.
Bring next digit (1) of the dividend behind the 10 and repeat the process: 101 / 903

On to step 5:
903 goes into 101 0 times with a remainder of 101.
The next digit of our result is 0. 
Result so far: 20.0
The remainder is 101 after subtracting 0 from 101.
Grab the next digit (8) from the dividend, add it to 101, then carry on: 1018 / 903

Step 6:
The number 903 fits into 1018 1 times, leaving a remainder of 115.
The next digit of our result is 1. 
Result so far: 201.0
If we take 903 away from 1018, we end up with 115.
Grab the next digit (7) from the dividend, add it to 115, then carry on: 1157 / 903

Going ahead to step 7:
903 can be fit into 1157 1 times, resulting in a remainder of 254.
The number 1 becomes the next digit in our result. 
Result so far: 2011.0
If we take 903 away from 1157, we end up with 254.
Include the next digit (3) from the dividend after 254, then repeat: 2543 / 903

Moving on to step 8:
When dividing 2543 by 903, we get 2 with a remainder of 737.
Put 2 as the next digit of the answer. 
Result so far: 20112.0
Subtract 1806 from 2543 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.

Step 9:
The number 903 fits into 7370 8 times, leaving a remainder of 146.
The number 8 becomes the next digit in our result. 
Result so far: 20112.8
If we subtract 7224 from 7370, we get 146.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1460, and continue the process.

Step 10:
If we divide 1460 by 903, we get 1 and a remainder of 557.
Write down 1 as next digit of the result. 
Result so far: 20112.81
Subtract 903 from 1460 to get 557.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5570, and continue the process.

Moving on to step 11:
If we divide 5570 by 903, we get 6 and a remainder of 152.
The number 6 becomes the next digit in our result. 
Result so far: 20112.816
If we subtract 5418 from 5570, we get 152.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1520, and continue the process.

Let's proceed to step 12:
903 goes into 1520 1 times with a remainder of 617.
Record the quotient 1 as the next digit in the result. 
Result so far: 20112.8161
If we subtract 903 from 1520, we get 617.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6170, and continue the process.

Advancing to step 13:
903 goes into 6170 6 times with a remainder of 752.
The next digit of our result is 6. 
Result so far: 20112.81616
If we take 5418 away from 6170, we end up with 752.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7520, and continue the process.

Advancing to step 14:
903 goes into 7520 8 times with a remainder of 296.
The next digit of our result is 8. 
Result so far: 20112.816168
Subtract 7224 from 7520 to get 296.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2960, and continue the process.

Advancing to step 15:
If we divide 2960 by 903, we get 3 and a remainder of 251.
Record the quotient 3 as the next digit in the result. 
Result so far: 20112.8161683
If we take 2709 away from 2960, we end up with 251.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2510, and continue the process.

Let's proceed to step 16:
2510 divided by 903 is 2 with a remainder of 704.
Record the quotient 2 as the next digit in the result. 
Result so far: 20112.81616832
Subtracting 1806 from 2510 leaves us with 704.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7040, and continue the process.

In conclusion, the division gives 20112.81616832 with a balance of 7.04e-07.