The number of integral divisors of 720 is
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720 = 24 × 32 × 51
So, the number of integral divisors of 720 are
(4 + 1) × (2 + 1) × (1 + 1) = 5 × 3 × 2 = 30
1, 2, 3, 4, 5, 6, 8, 9, 10,12, 15, 16, 18, 20, 24, 30, 36, 40, 45,48, 60, 72, 80, 90, 120, 144, 180, 240, 360, 720
So, the number of integral divisors of 720 are
(4 + 1) × (2 + 1) × (1 + 1) = 5 × 3 × 2 = 30
1, 2, 3, 4, 5, 6, 8, 9, 10,12, 15, 16, 18, 20, 24, 30, 36, 40, 45,48, 60, 72, 80, 90, 120, 144, 180, 240, 360, 720
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