To find the volume of a right rectangular prism, we use the formula:
\[ \text{Volume} = \text{Base Area} \times \text{Height} \]
Given that the area of the base is 20 square units and the height is 3 units, we can substitute these values into the formula:
\[ \text{Volume} = 20 , \text{square units} \times 3 , \text{units} \]
Calculating that gives:
\[ \text{Volume} = 60 , \text{cubic units} \]
Thus, the volume of the right rectangular prism is \( \boxed{60} \) cubic units.