Express 20 as the sum of some composite numbers, what is the largest product of these composite numbers?
将20表示成一些合数之和，这些合数的乘积的最大是多少？
<gadget id="calculator">4 * 4 * 4 * 4 * 4</gadget>
<output>1_024</output>

<result>1_024</result>