2 x 2 x 2 x 2 x 2 x 2 = 64
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the number 90 has the most factors under 100
There are 4 prime numbers under ten.
The largest prime number under 10,000,000 is 9,999,991
The largest prime under 20 is 19.
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 .