We're dividing 40436 by 20 
We want to divide 40436 by 20.

Advancing to step 1:
If we divide 4 by 20, we get 0 and a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Append the next digit (0) from the dividend to 4 and continue with: 40 / 20

Step 2:
20 goes into 40 2 times with a remainder of 0.
The next digit of our result is 2. 
Result so far: 2.0
If we take 40 away from 40, we end up with 0.
Take the next digit (4) from the dividend and append it to 0, then repeat: 4 / 20

Step 3:
The number 20 fits into 4 0 times, leaving a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 20.0
If we subtract 0 from 4, we get 4.
Grab the next digit (3) from the dividend, add it to 4, then carry on: 43 / 20

Advancing to step 4:
When dividing 43 by 20, we get 2 with a remainder of 3.
Use 2 as the next digit of our solution. 
Result so far: 202.0
If we take 40 away from 43, we end up with 3.
Fetch the next digit (6) from the dividend, attach it to 3 and continue: 36 / 20

Let's proceed to step 5:
When dividing 36 by 20, we get 1 with a remainder of 16.
Put 1 as the next digit of the answer. 
Result so far: 2021.0
Deduct 20 from 36 and we're left with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 6:
The number 20 fits into 160 8 times, leaving a remainder of 0.
Record the quotient 8 as the next digit in the result. 
Result so far: 2021.8
If we subtract 160 from 160, 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.

Advancing to step 7:
20 goes into 0 0 times with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 2021.8
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.

Advancing to step 8:
If we divide 0 by 20, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 2021.8
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 2021.8, with a leftover of 0.0.