List of numbers

This is a list of articles about numbers (not about numerals).

(Notice: In set theory and computer science, 0 is a natural number)

Other numbers that are notable for their mathematical properties or cultural meanings include:

A prime number is a positive integer which has exactly two divisors: 1 and itself.

The first 100 prime numbers are:

A highly composite number (HCN) is a positive integer with more divisors than any smaller positive integer. They are often used in geometry, grouping and time measurement.

The first 20 highly composite numbers are:

1, 2, 4, 6, 12, 24, 36, 48, 60, 120, 180, 240, 360, 720, 840, 1260, 1680, 2520, 5040, 7560.

A perfect number is an integer that is the sum of its positive proper divisors (all divisors except itself).

The first 10 perfect numbers:

In the following tables, [and] indicates that the word and is used in some dialects (such as British English), and omitted in other dialects (such as American English).

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