20 is an integer and not a fraction. However, it can be expressed in rational form as 20/1 which cannot be simplified.
20/1
20/3
39/20
11/20
1/20
3/20
2.65 in fraction form is 53/20
0.65 in fraction= 65/100 or 13/20
1.65 as a fraction = 165/100 or 33/20
7.15 as a fraction = 715/100 or 143/20
20% = 1⁄5
20 ^ -4 = 1/160000