After painting the surface of a large cuboid with red, it is divided into several small cuboids of the same size, and there are exactly 12 of them with only two surfaces painted red, so how many small cuboids should the original large cuboid be divided into at least?
把一个大长方体表面涂满红色后，分割成若干个同样大小的小长方体，其中只有两个面涂上红色的恰好是12个，那么原来的大长方体至少被分割成多少个小长方体．
<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">5 * 2 * 2</gadget>
<output>20</output>

<result>20</result>