Count the number of divisors of a positive integer n.
Random tests go up to n = 500000.
divisors(4) == 3 // 1, 2, 4
divisors(5) == 2 // 1, 5
divisors(12) == 6 // 1, 2, 3, 4, 6, 12
divisors(30) == 8 // 1, 2, 3, 5, 6, 10, 15, 30
count-divisors
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