The largest prime under 20 is 19.
5 is the greatest prime factor of 20.
19
19
Prime numbers can't have whole number square roots, of course, but the largest prime number under 400 is 397.
23 is the only prime number between 20 and 28.
23 is the only prime number between 20 and 29.
19 is prime.
35 - 19 (the largest prime number less than 20) = 16 Doreen is 16 years old.
The prime numbers between 20 and 30 are 23 and 29.
The only prime n umber between 20 and 25 is 23.
No.