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number theory junior
Problem
How many positive factors does have?
(A)
(B)
(C)
(D)
(E)
Solution
We can first find the prime factorization of , which is . Now, we add one to our powers and multiply. Therefore, the answer is Note: 23232 is a large number, so we can look for shortcuts to factor it. One way to factor it quickly is to use 3 and 11 divisibility rules to observe that . Another way is to spot the "32" and compute that .
Final answer
E