+820 is a [natural number](/wiki/natural_number) that follows 819 and precedes 821, often appearing in various systems of [numeration](/wiki/numeration). It may signify a specific year, a model designation, or a precise value within a larger scheme.
+## See also
+- [Year](/wiki/year)
+- [Number](/wiki/number)
+- [Digit](/wiki/digit)
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