When Xiao Ming did an integer division with no remainder, he mistook the dividend 180 for 108, and the result was that the quotient was 6. What is the divisor in this problem.
小明做一道没有余数的整数除法时，把被除数180误成了108，结果商小了6．此题中的除数是多少．
<gadget id="calculator">180 - 108</gadget>
<output>72</output>

<gadget id="calculator">72 / 6</gadget>
<output>12</output>

<result>12</result>