Answer:
16
Explanation:
The number of divisors is the product of the powers of the prime factors after 1 has been added to each. In order for the total number of divisors to be 5, the number must be a prime raised to the 4th power. The only one in the given range is 2^4 = 16.
The divisors of 16 are 1, 2, 4, 8, 16.
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The smallest number with 5 prime factors is 2^5 = 32, so we assume you mean "divisors" when you say "factors."