What do the numbers 2, 3, 10, 12, 13, 20, and 27 have in common?

Joke answer: <span class='standouttext'>Spoiler : </span><span class='spoiler'>The all come with rice!</span> <img src="/ubbthreads/images/graemlins/delight.gif" alt="" />

There is a real answer, though... <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />