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Earn +20 ptsQ: How many proper divisors are in 7920?
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How do you find how many proper divisors 7920 has?
To find the number of divisors of a number, factor it into primes in power format; then the number of factors the number has is the product of the powers of the primes each incremented by 1. To find the proper divisors subtract one from thin number. The prime factorization of 7920 is 2^4 x 3^2 x 5 x 11, so it has (4 + 1) × (2 + 1) × (1 + 1) × (1 + 1) = 5 × 3 × 2 × 2 = 60 factors. As this includes the number itself and the proper factors of a number exclude the number, 7920 has 60 - 1 = 59 proper factors (divisors).
What are the proper divisors for 24?
1,2,3,4,6,8,12,24
What are the proper divisors of 81?
1, 3, 9 and 27
How many divisors does 320 have?
320 has 14 divisors.
What are the proper divisors of 24 and the sum of these divisors?
1, 2, 3, 4, 6, 8, 12, 24 (sum = 60)
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