621139 divided by 31 
We want to divide 621139 by 31.

On to step 1:
If we divide 6 by 31, we get 0 and a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Bring next digit (2) of the dividend behind the 6 and repeat the process: 62 / 31

Let's proceed to step 2:
When dividing 62 by 31, we get 2 with a remainder of 0.
The next digit of our result is 2. 
Result so far: 2.0
Deduct 62 from 62 and we're left with 0.
Include the next digit (1) from the dividend after 0, then repeat: 1 / 31

On to step 3:
1 divided by 31 is 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 20.0
If we take 0 away from 1, we end up with 1.
Bring next digit (1) of the dividend behind the 1 and repeat the process: 11 / 31

Advancing to step 4:
31 goes into 11 0 times with a remainder of 11.
The next digit of our result is 0. 
Result so far: 200.0
If we subtract 0 from 11, we get 11.
Grab the next digit (3) from the dividend, add it to 11, then carry on: 113 / 31

Going ahead to step 5:
113 divided by 31 is 3 with a remainder of 20.
Record the quotient 3 as the next digit in the result. 
Result so far: 2003.0
The remainder is 20 after subtracting 93 from 113.
Bring next digit (9) of the dividend behind the 20 and repeat the process: 209 / 31

On to step 6:
209 divided by 31 is 6 with a remainder of 23.
Record the quotient 6 as the next digit in the result. 
Result so far: 20036.0
Subtracting 186 from 209 leaves us with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Step 7:
The number 31 fits into 230 7 times, leaving a remainder of 13.
Put 7 as the next digit of the answer. 
Result so far: 20036.7
If we take 217 away from 230, we end up with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Let's proceed to step 8:
130 divided by 31 is 4 with a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 20036.74
If we subtract 124 from 130, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 9:
31 goes into 60 1 times with a remainder of 29.
Use 1 as the next digit of our solution. 
Result so far: 20036.741
If we take 31 away from 60, we end up with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

On to step 10:
290 divided by 31 is 9 with a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 20036.7419
Subtract 279 from 290 to get 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 11:
110 divided by 31 is 3 with a remainder of 17.
The next digit of our result is 3. 
Result so far: 20036.74193
The remainder is 17 after subtracting 93 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Going ahead to step 12:
31 can be fit into 170 5 times, resulting in a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 20036.741935
If we take 155 away from 170, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 13:
31 goes into 150 4 times with a remainder of 26.
Write down 4 as next digit of the result. 
Result so far: 20036.7419354
If we take 124 away from 150, we end up with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Going ahead to step 14:
31 goes into 260 8 times with a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 20036.74193548
Subtract 248 from 260 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The final outcome is 20036.74193548, with a leftover of 1.2e-08.