2 + 3 + 13
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As a product of its prime factors 2*3*3 = 18.
A prime number has only 2 factors which are 1 and itself. 11 and 7 equal 18 when added.
A Prime number has only 2 factors which are 1 and itself. 11 and 7 equal 18 when added.
2, 3 and 13
18 is not a prime number so no number can have 18 as a prime factor.