Perfect number

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A topic known well beyond its field, found in many languages.

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Notion

Domain

Science and technology

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What Wikipedia says

In number theory, a perfect number is a positive integer that is equal to the sum of its positive proper divisors, that is, divisors excluding the number itself. For instance, 6 has proper divisors 1, 2, and 3, and 1 + 2 + 3 = 6, so 6 is a perfect number.

Excerpt from the Wikipedia article “Perfect number”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Hyacinth, CC BY-SA 4.0, via Wikimedia Commons.