A cube cardboard box with sides 6 decimeters long. How many square decimeters of cardboard should be used to make 20 such cardboard boxes?
一种正方体硬纸盒，棱长6分米．做20个这样的硬纸盒，至少要用纸板多少平方分米？
<gadget id="calculator">6 * 6 * 6 * 20</gadget>
<output>4_320</output>

<result>4_320</result>