The factors of the set are 1,2,3,5. All three numbers are primes, so each has just two factors: itself and 1.
2 = 1, 2
3 = 1, 3
5 = 1, 5
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3, 5 and 7 have 2 factors. 81, 625 and 2401 have 5 factors.
Factors of 90: 2*3^2*5 Factors of 100: 2^2*5^2
The prime factorization of 1800 is 2 * 2 * 2 * 3 * 3 * 5 * 5, so the prime factors of 1800 are 2, 3 and 5
Its prime factors are 2, 3, 5 and as a product of its prime factors in exponents 2^3 times 3^3 times 5^3 = 27,000
22500 = 2 * 2 * 3 * 3 * 5 * 5 * 5 * 5