Let's divide 408923 by 20
We're looking to find how many times 20 goes into 408923.

Going ahead to step 1:
4 divided by 20 is 0 with 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 (0) from the dividend, attach it to 4 and continue: 40 / 20

Let's proceed to step 2:
When dividing 40 by 20, we get 2 with a remainder of 0.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
The remainder is 0 after subtracting 40 from 40.
Include the next digit (8) from the dividend after 0, then repeat: 8 / 20

Step 3:
When dividing 8 by 20, we get 0 with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 20.0
Subtract 0 from 8 to get 8.
Append the next digit (9) from the dividend to 8 and continue with: 89 / 20

Advancing to step 4:
89 divided by 20 is 4 with a remainder of 9.
Use 4 as the next digit of our solution. 
Result so far: 204.0
Deduct 80 from 89 and we're left with 9.
Bring next digit (2) of the dividend behind the 9 and repeat the process: 92 / 20

Advancing to step 5:
The number 20 fits into 92 4 times, leaving a remainder of 12.
Put 4 as the next digit of the answer. 
Result so far: 2044.0
If we subtract 80 from 92, we get 12.
Bring next digit (3) of the dividend behind the 12 and repeat the process: 123 / 20

On to step 6:
20 goes into 123 6 times with a remainder of 3.
Use 6 as the next digit of our solution. 
Result so far: 20446.0
If we subtract 120 from 123, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 7:
20 goes into 30 1 times with a remainder of 10.
Put 1 as the next digit of the answer. 
Result so far: 20446.1
Subtract 20 from 30 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 8:
20 can be fit into 100 5 times, resulting in a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 20446.15
Deduct 100 from 100 and we're left 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 9:
0 divided by 20 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 20446.15
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 10:
When dividing 0 by 20, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 20446.15
Deduct 0 from 0 and we're left 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 result is 20446.15 with a remainder of 0.0.