20, twenty everywhere

Apropos to nothing, I found this article (http://www.economist.com/node/21536656) about how the French love the number 20. It doesn’t really have a concrete answer of this obsession, just a few examples of how appropriate it is that the G-20 is meeting in Cannes.

Just an oddity I thought I would share with the class. Does anyone have any good ideas on why the French love the number 20 so much?