There is a number that is smaller than 20, is an even number, has a divisor of 3, and is a multiple of 4. What is this number?
有一个数，比20小，是偶数，有约数3，又有4的倍数，这个数是多少
<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<result>12</result>