What is the product of the greatest common divisor and least common multiple of 40 and 60?
40和60的最大公约数和最小公倍数的乘积是多少．
<gadget id="calculator">2 * 2 * 5</gadget>
<output>20</output>

<gadget id="calculator">2 * 2 * 5 * 2 * 3</gadget>
<output>120</output>

<gadget id="calculator">20 * 120</gadget>
<output>2_400</output>

<result>2_400</result>