20 is in its simplest form.
The simplest form of 20 is 20, as it appears in the question.
3/20 is in its simplest form.
20/9 is in its simplest form.
33/20 is in simplest form
20/153 is in its simplest form.
20/3 is in its simplest form.
17/20 is in its simplest form.
1/20 is in its simplest form.
11/20 is in its simplest form.
13/20 is the simplest form.
31/20 is in its simplest form.
23/20 = 13/20