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24 (twenty-four)
The number 24 has some interesting details.
Number circle
The number circle shows the cyclic structure of the natural numbers. That is caused by twin primes. After the number 24 the regularity breaks, as the number 25 emerges from preceeding primes, because 25 = 5 × 5.
Clocks
A day has 24 hours. Analog clocks usually display only 12 hours.