friendly number

noun

A number that shares its abundancy with another positive integer.

“The number 30 is a friendly number because both 30 and 140 have an abundancy index of 2.4.”

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Meanings

nounfriendly number (plural friendly numbers)

plural friendly numbers

  1. A number that shares its abundancy with another positive integer.

    The number 30 is a friendly number because both 30 and 140 have an abundancy index of 2.4.

Cite this entry
APA

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

MLA

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

Chicago

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

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