6120 cm³
1) Since it's a rectangular prism, then its volume can be found out, by using this formula below:
[tex]\begin{gathered} V=w\cdot l\cdot h \\ V=18\cdot17\cdot20 \\ V=6120cm^3 \end{gathered}[/tex]
2) Hence, the volume of that prism is 6120 cm³
