Divide 20 into the sum of several natural numbers. To make the product of these natural numbers as large as possible, then 20=what.
把20拆成若干个自然数的和．要使这些自然数的乘积尽量大，则20=多少．
<gadget id="calculator">2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2</gadget>
<output>20</output>

<result>20</result>