untouchable number

Questions

What does untouchable number mean?

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

How to pronounce untouchable number

1. Open the pronunciation page — Open the Speakur entry for “untouchable number”.
2. Read the phonetic spelling — Read the IPA spelling () so you know which sounds to aim for.
3. Play the audio — Click Play to hear reference audio for “untouchable number”.
4. Repeat and practice — Say “untouchable number” aloud, matching stress and vowels until it feels natural.