644432 ÷ 20 
We want to figure out the number of times 644432 can be divided by 20.

Let's proceed to step 1:
The number 20 fits into 6 0 times, leaving a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 20

Step 2:
64 divided by 20 is 3 with a remainder of 4.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
If we subtract 60 from 64, we get 4.
Fetch the next digit (4) from the dividend, attach it to 4 and continue: 44 / 20

Let's proceed to step 3:
When dividing 44 by 20, we get 2 with a remainder of 4.
Use 2 as the next digit of our solution. 
Result so far: 32.0
Deduct 40 from 44 and we're left with 4.
Grab the next digit (4) from the dividend, add it to 4, then carry on: 44 / 20

Moving on to step 4:
20 can be fit into 44 2 times, resulting in a remainder of 4.
Record the quotient 2 as the next digit in the result. 
Result so far: 322.0
The remainder is 4 after subtracting 40 from 44.
Grab the next digit (3) from the dividend, add it to 4, then carry on: 43 / 20

On to step 5:
If we divide 43 by 20, we get 2 and a remainder of 3.
The number 2 becomes the next digit in our result. 
Result so far: 3222.0
Subtract 40 from 43 to get 3.
Append the next digit (2) from the dividend to 3 and continue with: 32 / 20

On to step 6:
If we divide 32 by 20, we get 1 and a remainder of 12.
The number 1 becomes the next digit in our result. 
Result so far: 32221.0
If we take 20 away from 32, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 7:
The number 20 fits into 120 6 times, leaving a remainder of 0.
Put 6 as the next digit of the answer. 
Result so far: 32221.6
If we subtract 120 from 120, we 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 8:
When dividing 0 by 20, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 32221.6
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 9:
20 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 32221.6
If we take 0 away from 0, 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.

After the division, we end up with 32221.6 and a remainder of 0.0.