Number 20981

20981 is prime.

20981 prime factorization is 20981¹

20981 prime factorization is 20981

Divisors (2): 1, 20981

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Properties#

20981 is 1161st chen prime
20981 is 265th good prime
20981 is 2359th prime
20981 is 1172nd pythagorean prime
20981 is part of 357th twin prime {20981, 20983}

External#

Neighbours#

20969₁	20970	20971₁	20972	20973₁
20974₁	20975	20976	20977₁	20978
20979	20980	20981₅	20982	20983₄
20984	20985	20986	20987₁	20988
20989₁	20990	20991₁	20992	20993₁

Compare with#

20969₁	20970	20971₁	20972	20973₁
20974₁	20975	20976	20977₁	20978
20979	20980	20981₅	20982	20983₄
20984	20985	20986	20987₁	20988
20989₁	20990	20991₁	20992	20993₁

Different Representations#

20981 in base 2 is 101000111110101₂
20981 in base 3 is 1001210002₃
20981 in base 4 is 11013311₄
20981 in base 5 is 1132411₅
20981 in base 6 is 241045₆
20981 in base 7 is 115112₇
20981 in base 8 is 50765₈
20981 in base 9 is 31702₉
20981 in base 10 is 20981₁₀
20981 in base 11 is 14844₁₁
20981 in base 12 is 10185₁₂
20981 in base 13 is 971c₁₃
20981 in base 14 is 7909₁₄
20981 in base 15 is 633b₁₅
20981 in base 16 is 51f5₁₆

Belongs Into#

20981 belongs into first 1000 chen primes.
20981 belongs into first 500 good primes.
20981 belongs into first 1000 primes.
20981 belongs into first 1000 pythagorean primes.
20981 belongs into first 500 twin primes.

As Timestamp#

0 + 1 * 20981: Convert timestamp 20981 to date is 1970-01-01 05:49:41
0 + 1000 * 20981: Convert timestamp 20981000 to date is 1970-08-31 20:03:20
1300000000 + 1000 * 20981: Convert timestamp 1320981000 to date is 2011-11-11 03:10:00
1400000000 + 1000 * 20981: Convert timestamp 1420981000 to date is 2015-01-11 12:56:40
1500000000 + 1000 * 20981: Convert timestamp 1520981000 to date is 2018-03-13 22:43:20
1600000000 + 1000 * 20981: Convert timestamp 1620981000 to date is 2021-05-14 08:30:00
1700000000 + 1000 * 20981: Convert timestamp 1720981000 to date is 2024-07-14 18:16:40

You May Also Ask#

Smaller than 20981#

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