How many episodes are in a season of SpongeBob and if different amount of the sum of 4 season 7?

I want to know the number of episodes in a season of SpongeBob beacause I'm 11 and I saw that season 7 was 5.99 on iTunes so you can put it on my ipod nano. beacause next week I'll be on Sunday going somewhere near Santa Barbera and I wanted a little entertainment on the road, and im not asking im asking price of many episodes r in a season beacause if all are different, how many have Season 7 and which has most of the episodes. But the last two questions depend on the first question. Any help would be great! Thanks!

Hiii so I know the season has 20 episodes and eight seasons theres heres the link to the list of episodes http://en.wikipedia.org/wiki/List_of_SpongeBob_SquarePants_episodes hope it helps n.ñ au revoir

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