There are eight prime numbers under 20.
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There are infinite prime numbers as there is infinite numbers. You cannot limit the counting of primes.
16 prime numbers
15 prime numbers
Infinitely many numbers are relatively prime to 37. Because 37 is a prime number, all other numbers are relatively prime to it.
There are many, many more odd prime numbers than even prime numbers; there is only 1 even prime number, namely 2, whereas the odd prime numbers are 3, 5, 7, 11, ...