There is a natural number whose difference between the smallest two divisors is 4 and the difference between the largest two divisors is 308, what is this natural number?
有一个自然数，它的最小的两个约数的差是4，最大的两个约数的差是308，则这个自然数是多少．
<gadget id="calculator">1 + 4</gadget>
<output>5</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">308 / (4/5)</gadget>
<output>385</output>

<result>385</result>