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Find out how and where to watch "20/20" online on Netflix, Prime Video, and Disney+ today – including 4K and free options.

Japanese people commemorate the twentieth birthday with personal ceremonies, and it comes with a number of legal rights like the right to marry. To represent this, the Japanese language has a special …

Your guide to the number 20, an even composite number composed of two distinct primes. Mathematical info, prime factorization, fun facts and numerical data for STEM, education and fun.