How to find the Factors of 40

  • 40 is a composite number.
  • Prime factorization: 40 = 2x2x2x5, which can be written 40 = 23x51
  • The exponents in the prime factorization are 3 and 1. Adding one to each exponent and multiplying we get (3 + 1)(1 + 1) = 4x2 = 8. Therefore 40 has exactly 8 factors.
  • The factors of 40 are: 1, 2, 4, 5, 8, 10, 20 and 40
  • Factor pairs of 40 are: 1x40, 2x20, 4x10 and 5x8
  • 40 has at least one exponent greater than 1 in its prime factorization so √40 can be simplified. Taking this into account, we get √40 = 2x√10