• ← EulerPhi
• → FractionalPart

FactorInteger

WMA link

FactorInteger[n]

returns the factorization of n as a list of factors and exponents.

• • factors = FactorInteger[2010]

To get back the original number:

• • Times @@ Power @@@ factors

FactorInteger factors rationals using negative exponents:

• • FactorInteger[2010 / 2011]