FLOORRAND 65535 - 20000 + 1 + 20000

The expression "FLOOR(RAND() * (65535 - 20000 + 1) + 20000)" generates a random integer between 20000 and 65535 (inclusive).

Here's an example of how it works:

1. Calculate the difference between the upper and lower limits: (65535 - 20000 + 1) = 45536.
2. Generate a random decimal number between 0 and 1 using the RAND() function.
3. Multiply the random decimal number by the difference calculated in step 1: RAND() * 45536.
4. Add the lower limit (20000) to the result obtained in step 3: RAND() * 45536 + 20000.
5. Apply the FLOOR function to round down the result obtained in step 4 to the nearest integer: FLOOR(RAND() * 45536 + 20000).

By doing this, you will obtain a random integer between 20000 and 65535