We divide 666478 by 20
We're looking to find how many times 20 goes into 666478.

Step 1:
If we divide 6 by 20, we get 0 and a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Include the next digit (6) from the dividend after 6, then repeat: 66 / 20

On to step 2:
66 divided by 20 is 3 with a remainder of 6.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we take 60 away from 66, we end up with 6.
Take the next digit (6) from the dividend and append it to 6, then repeat: 66 / 20

Going ahead to step 3:
If we divide 66 by 20, we get 3 and a remainder of 6.
Write down 3 as next digit of the result. 
Result so far: 33.0
Deduct 60 from 66 and we're left with 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 20

Step 4:
20 goes into 64 3 times with a remainder of 4.
Put 3 as the next digit of the answer. 
Result so far: 333.0
If we subtract 60 from 64, we get 4.
Take the next digit (7) from the dividend and append it to 4, then repeat: 47 / 20

On to step 5:
When dividing 47 by 20, we get 2 with a remainder of 7.
Record the quotient 2 as the next digit in the result. 
Result so far: 3332.0
Subtracting 40 from 47 leaves us with 7.
Append the next digit (8) from the dividend to 7 and continue with: 78 / 20

Advancing to step 6:
The number 20 fits into 78 3 times, leaving a remainder of 18.
Write down 3 as next digit of the result. 
Result so far: 33323.0
Deduct 60 from 78 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 7:
20 can be fit into 180 9 times, resulting in a remainder of 0.
Use 9 as the next digit of our solution. 
Result so far: 33323.9
Subtracting 180 from 180 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 8:
0 divided by 20 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 33323.9
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 9:
If we divide 0 by 20, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 33323.9
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 33323.9, with a leftover of 0.0.