We look at the division of 20391231 by 146 
Our goal is to divide 20391231 by 146.

Moving on to step 1:
The number 146 fits into 2 0 times, leaving a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Append the next digit (0) from the dividend to 2 and continue with: 20 / 146

Moving on to step 2:
If we divide 20 by 146, we get 0 and a remainder of 20.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 20 leaves us with 20.
Grab the next digit (3) from the dividend, add it to 20, then carry on: 203 / 146

Advancing to step 3:
When dividing 203 by 146, we get 1 with a remainder of 57.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 146 from 203 leaves us with 57.
Fetch the next digit (9) from the dividend, attach it to 57 and continue: 579 / 146

Going ahead to step 4:
146 goes into 579 3 times with a remainder of 141.
The next digit of our result is 3. 
Result so far: 13.0
If we subtract 438 from 579, we get 141.
Grab the next digit (1) from the dividend, add it to 141, then carry on: 1411 / 146

Step 5:
The number 146 fits into 1411 9 times, leaving a remainder of 97.
Record the quotient 9 as the next digit in the result. 
Result so far: 139.0
Subtracting 1314 from 1411 leaves us with 97.
Grab the next digit (2) from the dividend, add it to 97, then carry on: 972 / 146

Step 6:
972 divided by 146 is 6 with a remainder of 96.
Put 6 as the next digit of the answer. 
Result so far: 1396.0
Subtracting 876 from 972 leaves us with 96.
Bring next digit (3) of the dividend behind the 96 and repeat the process: 963 / 146

Moving on to step 7:
If we divide 963 by 146, we get 6 and a remainder of 87.
The next digit of our result is 6. 
Result so far: 13966.0
Deduct 876 from 963 and we're left with 87.
Take the next digit (1) from the dividend and append it to 87, then repeat: 871 / 146

Moving on to step 8:
146 can be fit into 871 5 times, resulting in a remainder of 141.
The number 5 becomes the next digit in our result. 
Result so far: 139665.0
Subtracting 730 from 871 leaves us with 141.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1410, and continue the process.

Advancing to step 9:
When dividing 1410 by 146, we get 9 with a remainder of 96.
Use 9 as the next digit of our solution. 
Result so far: 139665.9
The remainder is 96 after subtracting 1314 from 1410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Going ahead to step 10:
The number 146 fits into 960 6 times, leaving a remainder of 84.
The next digit of our result is 6. 
Result so far: 139665.96
The remainder is 84 after subtracting 876 from 960.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Advancing to step 11:
146 can be fit into 840 5 times, resulting in a remainder of 110.
Use 5 as the next digit of our solution. 
Result so far: 139665.965
If we subtract 730 from 840, we get 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Advancing to step 12:
If we divide 1100 by 146, we get 7 and a remainder of 78.
Write down 7 as next digit of the result. 
Result so far: 139665.9657
If we subtract 1022 from 1100, we get 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Moving on to step 13:
If we divide 780 by 146, we get 5 and a remainder of 50.
Record the quotient 5 as the next digit in the result. 
Result so far: 139665.96575
If we subtract 730 from 780, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Advancing to step 14:
146 can be fit into 500 3 times, resulting in a remainder of 62.
The next digit of our result is 3. 
Result so far: 139665.965753
Subtracting 438 from 500 leaves us with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Moving on to step 15:
146 can be fit into 620 4 times, resulting in a remainder of 36.
The number 4 becomes the next digit in our result. 
Result so far: 139665.9657534
If we subtract 584 from 620, we get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

On to step 16:
The number 146 fits into 360 2 times, leaving a remainder of 68.
Put 2 as the next digit of the answer. 
Result so far: 139665.96575342
Subtract 292 from 360 to get 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

The quotient of the division is 139665.96575342, and the remainder is 6.8e-08.