untouchable numbers

A form of untouchable number — A positive integer that cannot be expressed as the sum of all the proper divisors of any positive integer (including the untouchable number itself).

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Meanings

noun
  1. pluralplural of untouchable number
Cite this entry
APA

untouchable numbers. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/untouchable%20numbers

MLA

“untouchable numbers.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/untouchable%20numbers. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “untouchable numbers,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/untouchable%20numbers.

Source: untouchable numbers on Wiktionary, CC BY-SA 4.0.