In mathematics
420 is: *the sum of four consecutive primes (101 + 103 + 107 + 109). *the sum of the first 20 positive even numbers. *a Root of a function, zero of the Mertens function and is sparsely totient number, sparsely totient. *a pronic number. *the smallest number divisible by the numbers 1 to 7, and as a consequence of that it is a Harshad number in every base from 2 to 10 except base 5. *a 141-polygonal number, gonal number. *a balanced number.In other fields
*420 (cannabis culture), 420 is a slang term that refers to the consumption of cannabis (drug), cannabis. April 20th is commonly celebrated as a holiday dedicated to the drug, due to the numerical form of the day being 4/20. *+420, 420 is the country calling code for Czech Republic.References
{{Integers, 4 Integers Internet memes