H(n) defined as 1/H(n)=[1/tau(n)]Sum(1/d), n even perfect,

[maxcat00]

The function H(n) is defined by

1/H(n)=[1/tau(n)]Sum(1/d), where the sum is over all d|n, n even perfect, and tau(n) the number of positive divisors of n.

I need to show that H(n) is an integer. I have no idea what to do. Any help please. Thank you