Use a square piece of paper with a side length of 20 cm, and cut out a square piece of paper of the same size with a side length of 3 cm from each of the four corners of the square piece of paper (and the cut square piece of paper will not be used anymore) , and then folded into a rectangular box without a cover, what is the volume of the folded rectangular box without a cover in cubic centimeters?
用一张边长为20厘米的正方形纸片，在此正方形纸片的四个角各剪去一个边长为3厘米的同样大小的正方形纸片(且剪下来的正方形纸片不再用)，然后再折成一个无盖的长方体盒子，则折成的无盖长方体盒子的容积为多少立方厘米．
<gadget id="calculator">20 - 3 - 3</gadget>
<output>14</output>

<gadget id="calculator">14 * 14 * 3</gadget>
<output>588</output>

<result>588</result>