Any of its factors including itself
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The simplest answer is 1 and 323.
The prime numbers between 15 and 20 are 17 and 19. To find the product of these two prime numbers, you simply multiply them together: 17 x 19 = 323. Therefore, the product of the prime numbers between 15 and 20 is 323.
323 and any of its multiples
323, 578 and 5929
The greatest common factor of the numbers 323 and 391 is 17.