GAUSS7 2015 Problem 9

Past Contests GAUSS7 GAUSS (GR. 7) - 2015
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1

The number 6 has exactly four positive divisors: 1,2,3, and 6. How many positive divisors does 20 have?

Answer Choices
A. 2
B. 6
C. 3
D. 5
E. 8