Usually means: Less than sum of divisors.
Definitions Related words Mentions
We found 7 dictionaries that define the word defective number:

General (4 matching dictionaries)
  1. defective number: Merriam-Webster
  2. defective number: Wiktionary
  3. defective number: Dictionary.com
  4. defective number: FreeDictionary.org

Computing (1 matching dictionary)
  1. defective number: Encyclopedia

Science (2 matching dictionaries)
  1. Defective Number: Eric Weisstein's World of Mathematics
  2. defective number: PlanetMath Encyclopedia

Definitions from Wiktionary (defective number)

noun:  (number theory) A deficient number.

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