In how many ways can a number be written as a product of two different factors?

In how many ways can a number be written as a product of two different factors?

Let Number=x

Let Its prime factors are:

2^a*3^b*5^c…………….and so on

Number of factors

=(a+1)(b+1)(c+1)………… and so on

Required number of ways

=[(a+1)(b+1)(c+1)………… and so on]/2

If Required number of ways result to a.b then Required number of ways=a+1