We look at the division of 20666661 by 521 
We're looking to find how many times 521 goes into 20666661.

On to step 1:
521 goes into 2 0 times with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Take the next digit (0) from the dividend and append it to 2, then repeat: 20 / 521

Let's proceed to step 2:
521 can be fit into 20 0 times, resulting in a remainder of 20.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 20, we end up with 20.
Append the next digit (6) from the dividend to 20 and continue with: 206 / 521

Moving on to step 3:
If we divide 206 by 521, we get 0 and a remainder of 206.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 206 after subtracting 0 from 206.
Bring next digit (6) of the dividend behind the 206 and repeat the process: 2066 / 521

Advancing to step 4:
If we divide 2066 by 521, we get 3 and a remainder of 503.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we take 1563 away from 2066, we end up with 503.
Grab the next digit (6) from the dividend, add it to 503, then carry on: 5036 / 521

Advancing to step 5:
521 goes into 5036 9 times with a remainder of 347.
Record the quotient 9 as the next digit in the result. 
Result so far: 39.0
Deduct 4689 from 5036 and we're left with 347.
Fetch the next digit (6) from the dividend, attach it to 347 and continue: 3476 / 521

Step 6:
When dividing 3476 by 521, we get 6 with a remainder of 350.
Use 6 as the next digit of our solution. 
Result so far: 396.0
If we take 3126 away from 3476, we end up with 350.
Take the next digit (6) from the dividend and append it to 350, then repeat: 3506 / 521

Let's proceed to step 7:
When dividing 3506 by 521, we get 6 with a remainder of 380.
Record the quotient 6 as the next digit in the result. 
Result so far: 3966.0
Subtracting 3126 from 3506 leaves us with 380.
Take the next digit (1) from the dividend and append it to 380, then repeat: 3801 / 521

On to step 8:
521 can be fit into 3801 7 times, resulting in a remainder of 154.
Put 7 as the next digit of the answer. 
Result so far: 39667.0
Subtract 3647 from 3801 to get 154.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1540, and continue the process.

Step 9:
The number 521 fits into 1540 2 times, leaving a remainder of 498.
Write down 2 as next digit of the result. 
Result so far: 39667.2
The remainder is 498 after subtracting 1042 from 1540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4980, and continue the process.

Moving on to step 10:
If we divide 4980 by 521, we get 9 and a remainder of 291.
Record the quotient 9 as the next digit in the result. 
Result so far: 39667.29
Subtracting 4689 from 4980 leaves us with 291.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2910, and continue the process.

On to step 11:
521 goes into 2910 5 times with a remainder of 305.
Record the quotient 5 as the next digit in the result. 
Result so far: 39667.295
The remainder is 305 after subtracting 2605 from 2910.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3050, and continue the process.

Step 12:
When dividing 3050 by 521, we get 5 with a remainder of 445.
The next digit of our result is 5. 
Result so far: 39667.2955
If we take 2605 away from 3050, we end up with 445.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4450, and continue the process.

After the division, we end up with 39667.2955 and a remainder of 0.00445.