The smallest Prime number between 0 and 30 is 2, and the largest is 29.
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From 30 to 40 they are 31 and 37
It depends on the degree to which numbers are rounded. To the nearest 20, the smallest is 10 and the biggest is just under 30.
2 x 3 x 5 = 30
The factors of 30 that are not prime numbers are 6, 10 and 30.
8 has three primes (2x2x2) in its factorization, and 30 is the smallest number having three different primes (2x3x5) in its factorization.