The number 6 has exactly four positive divisors: $1,2,3$, and 6 . How many positive divisors does 20 have?
(A) 2
(B) 6
(C) 3
(D) 5
(E) 8
The positive divisors of 20 are: $1,2,4,5,10$, and 20 .

Therefore, the number 20 has exactly 6 positive divisors.

ANSWER: (B)