There is a natural number, the sum of its smallest two factors is 4, and the sum of its largest two factors is 100, find this natural number.
有一个自然数，它最小的两个因数之和是4，最大的两个因数之和是100，求这个自然数．
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">100 / 4</gadget>
<output>25</output>

<gadget id="calculator">100 - 25</gadget>
<output>75</output>

<result>75</result>