Kwan's beginning account balance was $\$ 20$. His ending balance is $\$ 0$. What integer epresents the change in his account alance from beginning to end? (Example 3)

Step 1 ：The question is asking for the change in Kwan's account balance. This can be calculated by subtracting the ending balance from the beginning balance. In this case, the beginning balance is \(20\) and the ending balance is \(0\).

Step 2 ：So, the change in balance would be \(0 - 20 = -20\). The negative sign indicates that the balance decreased.

Step 3 ：Final Answer: The integer that represents the change in Kwan's account balance from beginning to end is \(\boxed{-20}\).