We look at the division of 20108971 by 138 
Let's see how many times 138 fits into 20108971.

On to step 1:
The number 138 fits into 2 0 times, leaving a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Bring next digit (0) of the dividend behind the 2 and repeat the process: 20 / 138

Moving on to step 2:
138 can be fit into 20 0 times, resulting in a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 20 to get 20.
Bring next digit (1) of the dividend behind the 20 and repeat the process: 201 / 138

Advancing to step 3:
If we divide 201 by 138, we get 1 and a remainder of 63.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 138 from 201 to get 63.
Take the next digit (0) from the dividend and append it to 63, then repeat: 630 / 138

Going ahead to step 4:
If we divide 630 by 138, we get 4 and a remainder of 78.
The next digit of our result is 4. 
Result so far: 14.0
If we take 552 away from 630, we end up with 78.
Bring next digit (8) of the dividend behind the 78 and repeat the process: 788 / 138

Let's proceed to step 5:
788 divided by 138 is 5 with a remainder of 98.
Use 5 as the next digit of our solution. 
Result so far: 145.0
Subtracting 690 from 788 leaves us with 98.
Append the next digit (9) from the dividend to 98 and continue with: 989 / 138

Let's proceed to step 6:
138 goes into 989 7 times with a remainder of 23.
Put 7 as the next digit of the answer. 
Result so far: 1457.0
If we subtract 966 from 989, we get 23.
Append the next digit (7) from the dividend to 23 and continue with: 237 / 138

Step 7:
237 divided by 138 is 1 with a remainder of 99.
The number 1 becomes the next digit in our result. 
Result so far: 14571.0
If we take 138 away from 237, we end up with 99.
Fetch the next digit (1) from the dividend, attach it to 99 and continue: 991 / 138

Going ahead to step 8:
991 divided by 138 is 7 with a remainder of 25.
Put 7 as the next digit of the answer. 
Result so far: 145717.0
The remainder is 25 after subtracting 966 from 991.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Going ahead to step 9:
The number 138 fits into 250 1 times, leaving a remainder of 112.
The next digit of our result is 1. 
Result so far: 145717.1
Subtract 138 from 250 to get 112.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1120, and continue the process.

Let's proceed to step 10:
1120 divided by 138 is 8 with a remainder of 16.
Put 8 as the next digit of the answer. 
Result so far: 145717.18
If we take 1104 away from 1120, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 11:
If we divide 160 by 138, we get 1 and a remainder of 22.
Use 1 as the next digit of our solution. 
Result so far: 145717.181
Deduct 138 from 160 and we're left with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Moving on to step 12:
If we divide 220 by 138, we get 1 and a remainder of 82.
Use 1 as the next digit of our solution. 
Result so far: 145717.1811
If we subtract 138 from 220, we get 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

The final result is 145717.1811 with a remainder of 0.00082.