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What is the sum of the distinct prime integer divisors of $2016 ?$ (2016 AMC 8 Problem, Question \#9) 
Overseas Competition->Knowledge Point->Number Theory Modules
The prime factorization is $2016=2^{5} \times 3^{2} \times 7$. Since the problem is only asking us for the distinct prime factors, we have $2,3,7$. Their desired sum is then (B) 12 