19910 ÷ 5 = 3982 R0
Alright, let's work through the division of 19910 by 5 step by step.

Step 1:
5 goes into 1 0 times with a remainder of 1.
Write down 0 as next digit of of the result. 
Result so far: 0
Subtract 0 from 1 to get 1.
Bring next digit (9) of the dividend behind the 1 and repeat the process: 19 / 5

Step 2:
5 goes into 19 3 times with a remainder of 4.
Write down 3 as next digit of of the result. 
Result so far: 3
Subtract 15 from 19 to get 4.
Bring next digit (9) of the dividend behind the 4 and repeat the process: 49 / 5

Step 3:
5 goes into 49 9 times with a remainder of 4.
Write down 9 as next digit of of the result. 
Result so far: 39
Subtract 45 from 49 to get 4.
Bring next digit (1) of the dividend behind the 4 and repeat the process: 41 / 5

Step 4:
5 goes into 41 8 times with a remainder of 1.
Write down 8 as next digit of of the result. 
Result so far: 398
Subtract 40 from 41 to get 1.
Bring next digit (0) of the dividend behind the 1 and repeat the process: 10 / 5

Step 5:
5 goes into 10 2 times with a remainder of 0.
Write down 2 as next digit of of the result. 
Result so far: 3982
Subtract 10 from 10 to get 0.

The final result is 3982 with a remainder of 0.