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Watch full episodes of 20/20, a TV show that combines hard-hitting reports, newsmaker interviews and compelling human interest stories. Explore the latest cases of murder, mystery, crime and drama from the past and present.
Learn about the mathematical, scientific, and cultural significance of the number 20. Find out how 20 relates to primes, polygons, polyhedra, polytopes, sporadic groups, and more.
- twenty
- 20th, (twentieth)
- 2² × 5
- vigesimal
Learn the meaning, pronunciation, and usage of the number twenty, as well as related words and phrases. See examples of twenty in sentences and its etymology and history.
20/20 full episode guide offers a synopsis for every episode in case you missed a show. Browse the list of episode titles to find summary recap you need to get caught up. Visit The official 20/20 online at ABC.com. Get exclusive videos, blogs, photos, cast bios, free episodes and more.
20/20 features true crime, exclusive interviews, investigative reports and high profile stories. Watch full episodes of 20/20 free online on the official site of the award-winning program.
Learn how to find the factors of 20 by pair factorization, division method and prime factorization. See the table of contents, video lesson and FAQs on the factors of 20 and its prime factors.
Learn the meaning, pronunciation, and history of the cardinal number 20, as well as its slang and informal uses. Find out how to use twenty in a sentence and see related words and quizzes.
