Question 148
Alessandra writes in the notebook (Luigi's) all natural numbers $n$ that have both of the following properties: $n$ has exactly 4 positive divisors (including 1 and $n$ itself), and the sum of the positive divisors of $n$ is 42. What is the sum of all the numbers written by Alessandra?
(A) 0
(B) 12
(C) 20
(D) 26
(E) 42
(A) 0
(B) 12
(C) 20
(D) 26
(E) 42