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

Pick one

A $2$ B $6$ C $3$ D $5$ E $8$

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Official solution

The positive divisors of 20 are: $1,2,4,5,10,$ and 20.
Therefore, the number 20 has exactly 6 positive divisors.

Source: CEMC, University of Waterloo, licensed CC-BY-NC-4.0. Statement reproduced verbatim; metadata (topic, difficulty, ordering) added by this project.