What are the factors of 1/2 x

Depending on the value of 'x', the numerical value of that expression
could have almost anything for factors. 

For example, if  [ x=512 ]  then  1/2x = 256, and the factors of  1/2x  are

        1,  2,  4,  8,  16,  32,  64,  128, and  256 .

But the only factors you can always be sure of, that don't depend on the
value of 'x', are

         1,  1/2,  x,  and  1/2x .