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Meaning of untouchable number | Babel Free

Noun CEFR B2

Definitions

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

CEFR level

B2

Upper Intermediate
This word is part of the CEFR B2 vocabulary — upper intermediate level.

See also

untouchableness Untouchables Untouchably Untouched untouchedness Untoward