20409 Full Form. Full Meaning of 20409 Find long form and abbreviation, slang or definition of 20409. What does 20409 mean? What does 20409 stand for? We are providing world largest and most comprehensive acronyms, names, abbreviations database directory on the Internet. Our data base contains more than 8,00,000 terms abbreviations and acronyms. You can also search unique terms more than 4,00,000 general Comprehensive words.