Find the sum of divisors of 544 which are perfect squares Choices.
A) 21
B) 22
C) 23
D) 24
E) 25

Rationale: perfect squares divisiors are 1 , 2 ^ 2 & 2 ^ 4 only sum of divisors of 544 which are perfect squares = 1 + 2 ^ 2 + 2 ^ 4 = 21 answer : a
Answer: A