Context: CREATE TABLE table_name_30 (sunk_by_warship_or_raider VARCHAR, german_submarines_lost VARCHAR, sunk_by_aircraft VARCHAR)
Question: What is the total number sunk by warship or raider with 20 German submarines lost and more than 21616 sunk by aircraft?
Answer: SELECT COUNT(sunk_by_warship_or_raider) FROM table_name_30 WHERE german_submarines_lost = 20 AND sunk_by_aircraft > 21616