Multiple choice general knowledge math & puzzles Product of Prime no. between 1 to 20? 21 9699690 9699960 1800251 Reveal answer Fill a bubble to check yourself B Correct answer Explanation The prime numbers between 1 and 20 are 2, 3, 5, 7, 11, 13, 17, and 19. Multiplying them: 2 * 3 * 5 * 7 * 11 * 13 * 17 * 19 = 9,699,690.