Question

Difficulty: EasyFactors, Multiples, and Prime Factorization

Consider the positive integer N=60N = 60. Which of the following statements regarding the factors and prime factorization of NN is/are correct?

  1. The total number of positive factors of 6060 is 1212.Answer
  2. The prime factorization of 6060 is 22×31×512^2 \times 3^1 \times 5^1.Answer
  3. C
    The sum of all distinct prime factors of 6060 is 1111.
  4. D
    The number 6060 has exactly 66 odd positive factors.

Answer

The total number of positive factors of 60 is 12, and the prime factorization of 60 is 22×31×512^2 \times 3^1 \times 5^1.
The statement declaring that the total number of positive factors is 1212 is correct because (2+1)(1+1)(1+1)=12(2+1)(1+1)(1+1) = 12. Furthermore, the statement giving prime factorization as 22×31×512^2 \times 3^1 \times 5^1 is correct as it accurately breaks down 6060 into prime bases.

Step-by-Step Solution

1
Find the prime factorization of 6060
60=22×31×5160 = 2^2 \times 3^1 \times 5^1
Decomposing 6060 into its prime components provides the exponents needed for factor analysis.
2
Calculate the total number of positive factors
Total factors = (2+1)(1+1)(1+1)=3×2×2=12(2+1)(1+1)(1+1) = 3 \times 2 \times 2 = 12
Adding 11 to each prime exponent and multiplying gives the total count of positive factors.
3
Evaluate the distinct prime factors and their sum
Distinct prime factors are 2,3,52, 3, 5, and their sum is 2+3+5=102 + 3 + 5 = 10
Verifying distinct prime sum shows that claiming a sum of 1111 is incorrect.
4
Calculate the number of odd factors
Odd factors = (1+1)(1+1)=4(1+1)(1+1) = 4
Odd factors depend only on odd prime bases (31×513^1 \times 5^1), yielding 44 odd factors (1,3,5,151, 3, 5, 15).

Key Concept

Prime Factorization and Factor Counting Formula
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