+A **proper divisor** of an integer is any positive [divisor](/wiki/divisor) of that integer, other than the integer itself. These smaller components are the building blocks that sum to less than their host. For instance, the proper divisors of 10 are 1, 2, and 5, a concept central to identifying [perfect numbers](/wiki/perfect_number).
+## See also
+- [Factor](/wiki/factor)
+- [Prime number](/wiki/prime_number)
+- [Perfect number](/wiki/perfect_number)
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