As numerals the difference between twenty and thirty
is that
twenty is the cardinal number , occurring after nineteen and before twenty-one while
thirty is the cardinal number occurring after twenty-nine and before thirty-one, represented in arabic numerals as.
As nouns the difference between twenty and thirty
is that
twenty is (colloquial) a banknote with a denomination of 20 while
thirty is (slang) a rack of thirty beers.