Mr. Li bought back a box of mineral water, counting 4 bottles of 4 bottles or 5 bottles of 5 bottles, and they all just finished counting. How many bottles are there at least in this case of mineral water?
李老师买回一箱矿泉水，4瓶4瓶地数或5瓶5瓶地数，都刚好数完．这箱矿泉水至少有几瓶？
<gadget id="calculator">2 * 2 * 5</gadget>
<output>20</output>

<result>20</result>