1. **State the problem:** Calculate the sum of 20 and 2. 2. **Formula used:** Addition of two numbers is given by $a + b$. 3. **Apply the formula:** Here, $a = 20$ and $b = 2$, so we calculate $20 + 2$. 4. **Perform the addition:** $20 + 2 = 22$. 5. **Final answer:** The sum of 20 and 2 is $22$.