What is a 20 euro is worth?

It depends on the currency you want to change.

August 2008:

20 euro € is 31.60 US dollars.

More

Exchange rates change every day so any answer posted here (like the one above) becomes out of date almost immediately. While it's not normal WikiAnswers policy to say "use the internet", that's the best approach in this case. You can check a site such as www.xe.com, CNNMoney, etc. for the latest conversion factors.