1320 делится на 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 22, 30, 33, 40, 44, 55, 60, 66, 110, 132, 165, 220, 264, 330, 440, 660, 1320.

990 делится на 2, 3, 5, 6, 9, 10, 11, 15, 18, 22, 30, 33, 45, 55, 66, 90, 99, 110, 165, 198, 330, 495, 990.