Both $ 1 $ and $ 11 $ divide $ 11, $ so $ \boxed{11}=2 $, and since $ 1, $ $ 2, $ $ 4, $ $ 5, $ $ 10, $ and $ 20 $ divide $ 20, $ then $ \boxed{20}=6 $. The inner expression, $ \boxed{11}\times\boxed{20}=2\times6=12 $. Finally, $ \boxed{12}=6 $ because $ 1, $ $ 2, $ $ 3, $ $ 4, $ $ 6, $ and $ 12 $ divide $ 12 $. Therefore, $ 6 $ is our answer. Please note that we have not boxed the correct answer as we normally do, as that would be especially confusing for this problem.