435439 ÷ 20 
We're looking to find how many times 20 goes into 435439.

Advancing to step 1:
If we divide 4 by 20, we get 0 and a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Fetch the next digit (3) from the dividend, attach it to 4 and continue: 43 / 20

Step 2:
When dividing 43 by 20, we get 2 with a remainder of 3.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtract 40 from 43 to get 3.
Fetch the next digit (5) from the dividend, attach it to 3 and continue: 35 / 20

Moving on to step 3:
35 divided by 20 is 1 with a remainder of 15.
Record the quotient 1 as the next digit in the result. 
Result so far: 21.0
The remainder is 15 after subtracting 20 from 35.
Grab the next digit (4) from the dividend, add it to 15, then carry on: 154 / 20

Let's proceed to step 4:
20 goes into 154 7 times with a remainder of 14.
Record the quotient 7 as the next digit in the result. 
Result so far: 217.0
The remainder is 14 after subtracting 140 from 154.
Take the next digit (3) from the dividend and append it to 14, then repeat: 143 / 20

Going ahead to step 5:
The number 20 fits into 143 7 times, leaving a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 2177.0
If we subtract 140 from 143, we get 3.
Take the next digit (9) from the dividend and append it to 3, then repeat: 39 / 20

Advancing to step 6:
The number 20 fits into 39 1 times, leaving a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 21771.0
Deduct 20 from 39 and we're left with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Let's proceed to step 7:
The number 20 fits into 190 9 times, leaving a remainder of 10.
Put 9 as the next digit of the answer. 
Result so far: 21771.9
Subtracting 180 from 190 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 8:
100 divided by 20 is 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 21771.95
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.

Going ahead to step 9:
20 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 21771.95
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.

Moving on to step 10:
The number 20 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 21771.95
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.

In conclusion, the division gives 21771.95 with a balance of 0.0.