Expressed as a product of its prime factors, 2520 = 23 x 32 x 5 x 7
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2 * 2 * 2 * 3 * 3 * 5 * 7 = 2520
2520
Since the numbers 2509 and 2520 share no common positive integer factors, the proper fraction 2509/2520 is already expressed in its simplest form.
2520
All those numbers are mutually prime (5 and 7 are prime, full stop), so the least common denominator is 5x7x8x9.