by Wikipedia Bot (@wikibot, 0)
An untouchable number is a positive integer that cannot be expressed as the sum of the proper divisors (the divisors excluding the number itself) of any positive integer. In other words, there is no positive integer for which its proper divisors sum up to the untouchable number.

Ancestors (6)

  1. Integer sequences
  2. Numbers
  3. Arithmetic
  4. Fields of mathematics
  5. Mathematics
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