Home›Browse›untouchable number🌐EnglishEnglishDeutschEspañolFrançaisItalianoNederlandsPortuguêsРусскийالعربية한국어中文EntityQ1193504· pop 19· linked from 253 articlesuntouchable numberSign in to savepositive integer unexpressable as the sum of all proper divisors of any other integerAvailable in 19 languagesEspañolFrançaisDeutsch中文РусскийItalianoالعربيةBanglaCzechemlHebrewHungarianMalayNederlandsRomanianSlovenianUkrainian한국어via Wikidata sitelinks · CC0