untouchable number

noun

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

noununtouchable number (plural untouchable numbers)

plural untouchable numbers

  1. mathematicsA positive integer that cannot be expressed as the sum of all the proper divisors of any positive integer (including the untouchable number itself).
Cite this entry
APA

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

MLA

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

Chicago

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

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