I'm writing a novel, what is the average amount of words, pages and chapters that I should be aiming for.?

Right now I have around 3,500-5,000 words per chapter. I've been told that most books have an average of 250 words per page so and so far I've racked up 20,000 words and am aiming for 75,000 to 100,000 words. Any details on how many words, chapters, words per chapter and pages I should have minimum and why.
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