For any positive integer n, define to be the sum of the positive factors of n. For example, 6 = 1 + 2 + 3 + 6 = 12. Find 11.

AMC 8 2007 Problem 10

AMC8 2007 年第 10 题

整除与因数★★☆☆☆

For any positive integer n, define \boxedn to be the sum of the positive factors of n. For example, \boxed6 = 1 + 2 + 3 + 6 = 12. Find \boxed{\boxed11}.

对于任何正整数 n，定义. 为 n 的正因子之和。例如，。求。

A.13
B.20
C.24
D.28
E.30

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