1980 (number)

1980 is the natural number following 1979 and preceding 1981.

← 1979 1980 1981 →
List of numbers Integers ← 0 1k 2k 3k 4k 5k 6k 7k 8k 9k →
Cardinal	one thousand nine hundred eighty
Ordinal	1980th (one thousand nine hundred eightieth)
Factorization	22 × 32 × 5 × 11
Divisors	1, 2, 3, 4, 5, 6, 9, 10, 11, 12, 15, 18, 20, 22, 30, 33, 36, 44, 45, 55, 60, 66, 90, 99, 110, 132, 165, 180, 198, 220, 330, 396, 495, 660, 990, 1980
Greek numeral	,ΑϠΠ´
Roman numeral	MCMLXXX, mcmlxxx
Binary	111101111002
Ternary	22011003
Senary	131006
Octal	36748
Duodecimal	119012
Hexadecimal	7BC16

Mathematics

1980 is a pronic number,^[1] a highly abundant number,^[2] an e-perfect number^[3] and a coreful perfect number.^[4] Not only is it highly abundant, but it also has a greater aliquot sum than any smaller number.^[5]

1980 is the fourth number with 36 divisors.^[6] It forms an amicable triple with 2016 and 2556, since σ(1980) = σ(2016) = σ(2556) and 6552 = 1980 + 2016 + 2556.^[7]