666431 divided by 20 
We're looking to find how many times 20 goes into 666431.

Going ahead to step 1:
20 can be fit into 6 0 times, resulting in a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 20

On to step 2:
If we divide 66 by 20, we get 3 and a remainder of 6.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we take 60 away from 66, we end up with 6.
Grab the next digit (6) from the dividend, add it to 6, then carry on: 66 / 20

Let's proceed to step 3:
If we divide 66 by 20, we get 3 and a remainder of 6.
The number 3 becomes the next digit in our result. 
Result so far: 33.0
If we take 60 away from 66, we end up with 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 20

On to step 4:
20 can be fit into 64 3 times, resulting in a remainder of 4.
Use 3 as the next digit of our solution. 
Result so far: 333.0
The remainder is 4 after subtracting 60 from 64.
Bring next digit (3) of the dividend behind the 4 and repeat the process: 43 / 20

Moving on to step 5:
If we divide 43 by 20, we get 2 and a remainder of 3.
Record the quotient 2 as the next digit in the result. 
Result so far: 3332.0
Deduct 40 from 43 and we're left with 3.
Take the next digit (1) from the dividend and append it to 3, then repeat: 31 / 20

Going ahead to step 6:
The number 20 fits into 31 1 times, leaving a remainder of 11.
Put 1 as the next digit of the answer. 
Result so far: 33321.0
If we subtract 20 from 31, we 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.

Advancing to step 7:
When dividing 110 by 20, we get 5 with a remainder of 10.
Put 5 as the next digit of the answer. 
Result so far: 33321.5
The remainder is 10 after subtracting 100 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 8:
20 goes into 100 5 times with a remainder of 0.
The next digit of our result is 5. 
Result so far: 33321.55
If we take 100 away from 100, we end up 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.

In conclusion, the division gives 33321.55 with a balance of 0.0.