Last Updated：2025/11/30
Sentence
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Proving that a given integer is an untouchable number often requires checking that no positive integer has its proper divisors summing to that integer.
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Proving that a given integer is an untouchable number often requires checking that no positive integer has its proper divisors summing to that integer.
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Related words
untouchable number
Noun
Japanese Meaning
数学において、任意の正の整数の固有約数（その数自身を除くすべての正の約数）の和として表現されない正の整数を指す。
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