The first prime after 20 is 23.
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A prime number can be less than 20, but it is not a requirement that the number has to be under 20 to be considered prime. Here is a list of all the prime numbers under 20: 2, 3, 5, 7, 11, 13, 17, and 19 .
20 is not a prime number because 5 and 4 10 and 2 can also go into 20 not just 20 and 1
The largest prime under 20 is 19.
No, 20 is not a prime number. It is divisible by 2, 4, 5, and 10, in addition to 1 and 20.
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