How many articles do I need to get approval from adsense?

Hello DP-ers
I am newbie in the Internet Marketing world, so I prepared my blog before apply to adsense. I write about 20+ unique contents (I create it by myself). Is it not enough? because I got email from adsense that said "not enough content".
So how many articles do I need to get approval from adsense?

thank you

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