20 Look up twenty in Wiktionary, the free dictionary. Twenty or 20 may refer to: 20 (number), the natural number following 19 and preceding 21 one of the years 20 BC, AD 20, 1920, 2020 The meaning of the number 20: How is 20 spell, written in words, interesting facts, mathematics, computer science, numerology, codes. Phone prefix +20 or 0020. 20 in Roman Numerals and images. 20/20 full episode guide offers a synopsis for every episode in case you a missed a show. Browse the list of episode titles to find summary recap you need to get caught up. 20/20 Official Playlist - Season 47 (2024-2025) l ABC News by ABC News • Playlist • 19 videos • 8,628 views In some countries, the number 20 is used as an index in measuring visual acuity. 20/20 indicates normal vision at 20 feet (6.1 m), although it is commonly used to mean perfect vision in countries using the Imperial system. 20/20: Created by Roone Arledge. With David Muir, Amy Robach, Deborah Roberts, Elizabeth Vargas. ABC's original hour-long news magazine. Watch the official 20/20 online at ABC.com. Get exclusive videos, blogs, photos, cast bios, free episodes Watch a special edition of 20/20 tonight at 9/8c on ABC. The British Royal Family is linked to scandal when a former aide goes on the run after her boyfriend is murdered. The ancient Mayan numerical system – counting on fingers and toes – was a base 20 or vigesimal system. A polyhedron of 20 faces is an icosahedron, one of the five Platonic solids. A staple of primetime television on Friday nights for over 3 decades, 20/20 has remained a leader in American TV news magazines broadcasting on ABC.