+A proper divisor of a [natural number](/wiki/natural_number) is any positive divisor of the number, excluding the number itself. These divisors, sometimes called aliquot parts, are fundamental in classifying numbers and defining concepts like [perfect numbers](/wiki/perfect_number).
+## See also
+- [Divisor](/wiki/divisor)
+- [Prime Number](/wiki/prime_number)
+- [Abundant Number](/wiki/abundant_number)
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