The sum of five consecutive natural numbers is 20, what is the largest number among these five numbers?
五个连续自然数的和是20，这五个数中最大的数是多少．
<gadget id="calculator">20 / 5</gadget>
<output>4</output>

<gadget id="calculator">4 + 2</gadget>
<output>6</output>

<result>6</result>