Prove that if n is a positive integer such that the sum of the divisors of n is n + 1, then n is prime.

Solution:Step 1In this problem we need to prove that if sum of divisors of a positive integer n is n + 1, then n is a prime number.Step 2Prime number : A positive integer n which has only two divisors namely 1 and n itself. We know that every positive integer n has always 1 and n as its divisors. Considering that n has m divisors excluding 1 and n as where all are greater than zero....