20408 ÷ 8 = 2551 R0
We're going to perform division on 20408 with 8 as the divisor.

Step 1:
8 goes into 2 0 times with a remainder of 2.
Write down 0 as next digit of of the result. 
Result so far: 0
Subtract 0 from 2 to get 2.
Bring next digit (0) of the dividend behind the 2 and repeat the process: 20 / 8

Step 2:
8 goes into 20 2 times with a remainder of 4.
Write down 2 as next digit of of the result. 
Result so far: 2
Subtract 16 from 20 to get 4.
Bring next digit (4) of the dividend behind the 4 and repeat the process: 44 / 8

Step 3:
8 goes into 44 5 times with a remainder of 4.
Write down 5 as next digit of of the result. 
Result so far: 25
Subtract 40 from 44 to get 4.
Bring next digit (0) of the dividend behind the 4 and repeat the process: 40 / 8

Step 4:
8 goes into 40 5 times with a remainder of 0.
Write down 5 as next digit of of the result. 
Result so far: 255
Subtract 40 from 40 to get 0.
Bring next digit (8) of the dividend behind the 0 and repeat the process: 8 / 8

Step 5:
8 goes into 8 1 times with a remainder of 0.
Write down 1 as next digit of of the result. 
Result so far: 2551
Subtract 8 from 8 to get 0.

The final result is 2551 with a remainder of 0.