Almost sorry I started this thread! Thanks to all the replies, I think I understood Ignacio's reply the best.
If I've read correctly, each series has its own number of prizes with the top prize being 20,000,000 (if you win with a 20 Euro ticket you collect 200,000 as your 20 Euro has only bought a tenth of the full ticket).

Right except that the total prize is 2.000.000 €, and so, a tenth is 200.000.