That's 20 milliamps. Basically that's fine. Presumably you have a relatively modern radio or similar that needs memory from power? A clock? Alarm system?
If you have neither, then I frankly would expect zero. But if you have one of the above, 20 milliamps is right about where it should be.
Yep, it has a modern radio that requires memory. Thanks crazecar, your wisdom has helped me out again...lol