Sum all divisors of the natural number A in pairs to get several natural numbers. Among these natural numbers, the smallest number is 4, and the largest number is 324. What is A?
把自然数A的所有约数两两求和，得到若干个自然数，在这些自然数中，最小的数是4，最大的数是324，则A是多少？
<gadget id="calculator">3 / 1</gadget>
<output>3</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 + (1/3)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">324 / (4/3)</gadget>
<output>243</output>

<result>243</result>