title: R Function for returning ALL factors
body: <p>My normal search foo is failing me. I'm trying to find an R function that returns ALL of the factors of an integer. There are at least 2 packages with <code>factorize()</code> functions: gmp and conf.design, however these functions return only prime factors. I'd like a function that returns all factors. </p>
  
  <p>Obviously searching for this is made difficult since R has a construct called factors which puts a lot of noise in the search. </p>