The common factor is: 1
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The common factors of 18 and 36 are 18,9,6,3,2,1.
The prime factors of 494 are 2, 13, and 19. The prime factors of 741 are 3, 13, and 19. The common factors are 13 and 19, so the greatest common factor is 13 x 19 = 247.
Common factors of 15 and 18 are: 1 and 3.
The common positive integer factors of 18 and 30 are: 1, 2, 3, 6
The prime factors of 18 are 2, 3, and 3. The prime factors of 90 are 2, 3, 3, and 5. The prime factors they have in common are 2, 3, and 3. Since 18 is a factor of 90, its prime factors will be the prime factors that the two numbers have in common.