20 (number)

natural number

thumb|The Maya numerals are an example of a base-20 numeral system.

Blue-chip index consisting of the 20 major Belgian companies trading on the Euronext Brussels

Blue-chip index consisting of the 20 major Danish companies trading on Nasdaq Copenhagen

spoken guessing game using yes-no questions

Lebanese music chart

stock market index

Blue-chip index consisting of the 20 major Irish companies trading on Euronext Dublin

The icosathlon, also called double decathlon, is an ultra combined events of track and field competition consisting of 20 events. The word "icosathlon" was formed, in analogy to the word "decathlon", from Greek εἴκοσι (eíkosi, meaning "twenty") and ἄθλος (áthlos, or ἄθλον, áthlon, meaning "contest" or “prize”).