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 Related Terms
 Abundant Number:  A number in which the sum of all its proper divisors is greater than the number itself.
Angle: Region between two rays or the amount of rotation about a fixed point.
Amicable Numbers: Two numbers are amicable if each is the sum of the other number's proper divisors.
Deficient Number: A number in which the sum of all its proper divisors is less than the number itself.
Perfect Number: A number in which the sum of all of its proper divisors equals the number itself.
Proper Factor: All factors of a number other than 1 and the number itself.