  Let $a\geq 1, b\geq 0$ and $k\geq 2$ be any given integers. It has been
proven that there exist infinitely many natural numbers $m$ such that sum of
divisors of $m$ is a perfect $k$th power. We try to generalize this result when
the values of $m$ belong to any given infinite arithmetic progression $an+b$.
We prove if $a$ is relatively prime to $b$ and order of $b$ modulo $a$ is
relatively prime to $k$ then there exist infinitely many natural numbers $n$
such that sum of divisors of $an+b$ is a perfect $k$th power. We also prove
that, in general, either sum of divisors of $an+b$ is not a perfect $k$th power
for any natural number $n$ or sum of divisors of $an+b$ is a perfect $k$th
power for infinitely many natural numbers $n$.
