The six-digit \overline{3ABABA} is a multiple of 6, that is, it can be divisible by 6. How many such six-digit numbers are there?
六位数\overline{3ABABA}是6的倍数，即它能被6整除，问这样的六位数共有几个？
<gadget id="calculator">4 * 5</gadget>
<output>20</output>

<result>20</result>