Let $x,$ $y$ be elements of a group G. If $\textrm{ord}(x)=12$ and $\textrm{ord}(y)=20$, what are the possible values for the order of $\langle x \rangle \cap \langle y \rangle$?

Enter your answer as a list of numbers separated by commas, or a single number if there is only one possible value.