1,2,3,4,6 are factors of number 12

```
#include <stdio.h>
int main(void){
int i;
int num;
printf("Enter the number ");
scanf("%d",&num);
for ( i=1;i<num;i++){
if(num % i ==0){
printf("%d,",i);
}
}
return 0;
}
```

Output is here if you enter 12 as input
`1,2,3,4,6,`

There are some numbers for which only factors are 1 and itself ( same number ) , they are known as prime numbers.
List of Prime Numbers Common Factors of Two input numbers

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