2520 (number)

← 2519 2520 2521 →
List of numbers; Integers; ← 0 1k 2k 3k 4k 5k 6k 7k 8k 9k →
Cardinal	two thousand five hundred twenty
Ordinal	2520th; (two thousand five hundred twentieth)
Factorization	23 × 32 × 5 × 7
Greek numeral	,ΒΦΚ´
Roman numeral	MMDXX, mmdxx
Binary	1001110110002
Ternary	101101003
Senary	154006
Octal	47308
Duodecimal	156012
Hexadecimal	9D816

2520 (two thousand five hundred [and] twenty) is the natural number following 2519 and preceding 2521.

In mathematics

2520 is:

the smallest number divisible by all integers from one to ten, i.e., it is their least common multiple.
the last highly composite number that is half of the next highly composite number.
the eighteenth highly composite number, and the last highly composite number that is a divisor of all following highly composite numbers.
the seventh colossally abundant number.
palindromic in undecimal (1991₁₁) and a repdigit in bases 55, 59, and 62.
a Harshad number in all bases between binary and hexadecimal.
the aliquot sum of 1080.
the order of alternating group A_6, and the number of even permutations of 6 letters.

Factors

The factors, also called divisors, of 2520 are:

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 15, 18, 20, 21, 24, 28, 30, 35, 36, 40, 42, 45, 56, 60, 63, 70, 72, 84, 90, 105, 120, 126, 140, 168, 180, 210, 252, 280, 315, 360, 420, 504, 630, 840, 1260, 2520.

References

1 2 3 Koninck, Jean-Marie De (2009). "2520". Those Fascinating Numbers. American Mathematical Soc. p. 148. ISBN 978-0-8218-4807-4.
↑ Sloane, N. J. A. (ed.). "Sequence A072938". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
↑ Sloane, N. J. A. (ed.). "Sequence A106037". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
↑ Weisstein, Eric W. "Colossally Abundant Number". mathworld.wolfram.com. Wolfram Research, Inc. Retrieved 2026-10-26.
↑ Sloane, N. J. A. (ed.). "Sequence A001065 (Sum of proper divisors (or aliquot parts) of n: sum of divisors of n that are less than n.)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
↑ Weisstein, Eric W. "Alternating Group". mathworld.wolfram.com. Wolfram Research, Inc. Retrieved 2026-10-26.
1 2 Sloane, N. J. A. (ed.). "Sequence A001710 (Order of alternating group A_n, or number of even permutations of n letters.)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
↑ Weisstein, Eric W. "Even Permutation". mathworld.wolfram.com. Wolfram Research, Inc. Retrieved 2026-10-26.
↑ "properties of 2520". NumberWorld.info.

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[Koninck1-1] 1 2 3 Koninck, Jean-Marie De (2009). "2520". Those Fascinating Numbers. American Mathematical Soc. p. 148. ISBN 978-0-8218-4807-4.

[2] Sloane, N. J. A. (ed.). "Sequence A072938". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.

[3] Sloane, N. J. A. (ed.). "Sequence A106037". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.

[4] Weisstein, Eric W. "Colossally Abundant Number". mathworld.wolfram.com. Wolfram Research, Inc. Retrieved 2026-10-26.

[5] Sloane, N. J. A. (ed.). "Sequence A001065 (Sum of proper divisors (or aliquot parts) of n: sum of divisors of n that are less than n.)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.

[6] Weisstein, Eric W. "Alternating Group". mathworld.wolfram.com. Wolfram Research, Inc. Retrieved 2026-10-26.

[A001710-7] 1 2 Sloane, N. J. A. (ed.). "Sequence A001710 (Order of alternating group A_n, or number of even permutations of n letters.)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.

[8] Weisstein, Eric W. "Even Permutation". mathworld.wolfram.com. Wolfram Research, Inc. Retrieved 2026-10-26.

[9] "properties of 2520". NumberWorld.info.