420 (number)

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← 419 420 421 →
Cardinalfour hundred twenty
Ordinal420th
(four hundred twentieth)
Factorization22 × 3 × 5 × 7
Greek numeralΥΚ´
Roman numeralCDXX
Binary1101001002
Ternary1201203
Octal6448
Duodecimal2B012
Hexadecimal1A416

420 (four hundred [and] twenty) is the natural number following 419 and preceding 421.

In mathematics[edit]

420 is:

In other fields[edit]

  • 420 is a slang term that refers to the consumption of 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 is the country calling code for Czech Republic.
  • 4/20 as a date (April 20th) is also widely known as the birthday of German dictator Adolf Hitler.

References[edit]

  1. ^ "Sloane's A028442 : Numbers n such that Mertens' function is zero". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-02.
  2. ^ "Sloane's A036913 : Sparsely totient numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-02.
  3. ^ "Sloane's A002378 : Oblong (or promic, pronic, or heteromecic) numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-02.