24

View full site to see MathJax equation

24 < 23 | 25 >
Numbers 0 - 99
0	1	2	3	4	5	6	7	8	9
10	11	12	13	14	15	16	17	18	19
20	21	22	23	24	25	26	27	28	29
30	31	32	33	34	35	36	37	38	39
40	41	42	43	44	45	46	47	48	49
50	51	52	53	54	55	56	57	58	59
60	61	62	63	64	65	66	67	68	69
70	71	72	73	74	75	76	77	78	79
80	81	82	83	84	85	86	87	88	89
90	91	92	93	94	95	96	97	98	99

24 (twenty-four) is a positive integer following 23 and preceding 25.

Properties

• 24 is an even composite number and the fourth factorial number.
• There are 24 hours in a day.
• The 24th of December is known around the world as Christmas Eve.
• 24 is the largest number divisible by all integers less than its square root.
• It is the smallest positive integer whose square contains the digit 7.
• It is the 3rd smallest number that is known to be friendly. Its smallest friend is 91963648.
• It is the smallest non-unitary perfect number.

In googology

• In Greek-based number-naming systems, 24 is associated with prefix "tetraicosa-", and with prefix "quattuorviginti-" in Latin systems. In the Misalian seximal system, this number is called "foursy", because it's six times four.
• Furthermore, it is the largest number n with the following property: Let f: ℕ → ℕ, f(a) = a^a. Then for every a ∈ ℕ, there is a b ∈ ℕ, such that f^b+1(a) ≡ f^b(a) (mod n).
• HaydenTheGoogologist2009 coined Yummy! for this number, and it's the 3rd number in Meet yourself in 105 degrees Celsius.

Googological functions returning 24

• Factorial: 4! = 24
• Torian: \(T(3)=24\)
• Bouncing factorial: \(3\Lambda = 24\)

See also

• Septillion, 10²⁴ using the short scale
• Factorial