20981 (number)

20981 is an odd 5-digits prime number following 20980 and preceding 20982. In scientific notation, it is written as 2.0981 × 10^4. The sum of its digits is 20. It has a total of 1 prime factors and 2 positive divisors. There are 20980 positive integers (up to 20981) that are relatively prime to 20981.

Interesting facts

Basic properties

Name

Name twenty thousand nine hundred eighty-one

Notation

Scientific notation 2.0981 × 10^4
Engineering notation 2.0981 × 10^3

Prime Factorization of 20981

Prime Factorization 20981

Composite number
ω Distinct Factors 1
Total number of distinct prime factors
Ω Total Factors 1
Total number of prime factors
rad Radical 20981
Product of the distinct prime numbers

The prime factorization of 20981 is 20981. Since it has a total of 1 prime factors.

Most popular turbo-numbers

7, 4, 4, 63, 452, 825, 491, 6856, 65975, 74691, 35842, 774063, 5373748, 7915053, 35552573, 26946717, 79169146, 61940795, 832118584, 7949641194

Basic calculations (n = 20981)

Multiplication

n×y
n×2 41962
n×3 62943
n×4 83924
n×5 104905

Division

n÷y
n÷2 10490.5
n÷3 6993.6666666667
n÷3 5245.25
n÷5 4196.2

Exponentiation

ny
n2 440202361
n3 9235885736141
n4 193778118629974321
n5 4.0656587069755E+21

Nth Root

y√n
2√n 144.84819639885
3√n 27.580918688196
4√n 12.035289626712
5√n 7.3175422181998

Divisors of 20981

1, 20981

2 divisors

τ Total Divisors 2
Total number of the positive divisors of n
σ Sum of Divisors 20982
Sum of all the positive divisors of n
s Aliquot Sum 1
Sum of the proper positive divisors of n
A Arithmetic Mean 10491
Returns the sum of divisors (σ(n)) divided by the total number of divisors (τ(n))
G Geometric Mean 144.85164824744
Returns the nth root of the product of n divisors
H Harmonic Mean 1.9999046802021
Returns the total number of divisors (τ(n)) divided by the sum of the reciprocal of each divisors

The number 20981 can be divided by 2 positive divisors. The sum of these divisors (counting 20981) is 20982, the average is 10491.

Base conversion 20981

Base System Value
2 Binary 101000111110101
3 Ternary 1001210002
4 Quaternary 11013311
5 Quinary 1132411
6 Senary 241045
8 Octal 50765
10 Decimal 20981
12 Duodecimal 10185
16 Hexadecimal 51f5
20 Vigesimal 2c91
36 Base36 g6t

Cryptographic Hash Functions

md5 976232f256ded42986f7fde7ea4e2ded
sha1 ae2ab3a470e4b18660d395909637c9818cda64e0
sha256 5c2686000a69a3e50fd07b3a0fd45172da7cfb550af82449a6560a4ecf8cf5e5
sha512 fad5b9bce09903d0cfb6e34e528c4538fc744b19a4f163584880d14f252aea5bfa32cd9b181b3f6fbc0b08e3f66c87c02d1221dd05a6ac2279eb354a112e96bb
ripemd-160 f980dde5e0da74942b157a34148bb8094600cd2e

20981 as geometric shapes

Circle

Radius = n
Diameter 41962
Circumference 131827.51092993
Area 1382936503.4105

Sphere

Radius = n
Volume 38687187704074
Surface area 5531746013.6419
Circumference 131827.51092993

Square

Length = n
Perimeter 83924
Area 440202361
Diagonal 29671.61475215

Cube

Length = n
Surface area 2641214166
Volume 9235885736141
Space diagonal 36340.157993603

Equilateral Triangle

Length = n
Perimeter 62943
Area 190613213.71594
Altitude 18170.078996801

Triangular Pyramid

Length = n
Surface area 190613213.71594
Volume 1088459572381.6
Height 9890.5382507166