20987 (number)

20987 is an odd 5-digits composite number following 20986 and preceding 20988. In scientific notation, it is written as 2.0987 × 10^4. The sum of its digits is 26. It has a total of 2 prime factors and 4 positive divisors. There are 20280 positive integers (up to 20987) that are relatively prime to 20987.

Interesting facts

Basic properties

Name

Name twenty thousand nine hundred eighty-seven

Notation

Scientific notation 2.0987 × 10^4
Engineering notation 2.0987 × 10^3

Prime Factorization of 20987

Prime Factorization 31 × 677

Composite number
ω Distinct Factors 2
Total number of distinct prime factors
Ω Total Factors 2
Total number of prime factors
rad Radical 20987
Product of the distinct prime numbers

The prime factorization of 20987 is 31 × 677. Since it has a total of 2 prime factors.

Most popular turbo-numbers

4, 3, 18, 68, 326, 899, 3959, 851, 39588, 36977, 34394, 424299, 165757, 6108763, 25200333, 78371774, 457628101, 278058961, 3987798872, 8197855381

Basic calculations (n = 20987)

Multiplication

n×y
n×2 41974
n×3 62961
n×4 83948
n×5 104935

Division

n÷y
n÷2 10493.5
n÷3 6995.6666666667
n÷3 5246.75
n÷5 4197.4

Exponentiation

ny
n2 440454169
n3 9243811644803
n4 193999874989480561
n5 4.0714753764042E+21

Nth Root

y√n
2√n 144.86890625666
3√n 27.583547570516
4√n 12.036149976494
5√n 7.3179606942675

Divisors of 20987

1, 31, 677, 20987

4 divisors

τ Total Divisors 4
Total number of the positive divisors of n
σ Sum of Divisors 1
Sum of all the positive divisors of n
s Aliquot Sum -20986
Sum of the proper positive divisors of n
A Arithmetic Mean 0.25
Returns the sum of divisors (σ(n)) divided by the total number of divisors (τ(n))
G Geometric Mean 1
Returns the nth root of the product of n divisors
H Harmonic Mean 4
Returns the total number of divisors (τ(n)) divided by the sum of the reciprocal of each divisors

The number 20987 can be divided by 4 positive divisors. The sum of these divisors (counting 20987) is 1, the average is 0.25.

Base conversion 20987

Base System Value
2 Binary 101000111111011
3 Ternary 1001210022
4 Quaternary 11013323
5 Quinary 1132422
6 Senary 241055
8 Octal 50773
10 Decimal 20987
12 Duodecimal 1018b
16 Hexadecimal 51fb
20 Vigesimal 2c97
36 Base36 g6z

Cryptographic Hash Functions

md5 33a5ab413bb8e155ad89c29dbaced31a
sha1 ff54f5a59ed8886b2325c4e5b54be26cad70d664
sha256 7c4c4f0259bc9c2984c8b92d22b6e82bc7fcc84318fc463fae48d3021ccf03fa
sha512 fce04879c6f3b5314d5fc736fba79c638320363e80bfae31860c74581d89a0c8d6c25085343b1c95b98906b605d46dbf71a91286e0869887d7e0f58201f49899
ripemd-160 07de0729d30cb309423adc462c7a2a7a90f3533e

20987 as geometric shapes

Circle

Radius = n
Diameter 41974
Circumference 131865.21004178
Area 1383727581.5734

Sphere

Radius = n
Volume 38720387672641
Surface area 5534910326.2936
Circumference 131865.21004178

Square

Length = n
Perimeter 83948
Area 440454169
Diagonal 29680.100033524

Cube

Length = n
Surface area 2642725014
Volume 9243811644803
Space diagonal 36350.550298448

Equilateral Triangle

Length = n
Perimeter 62961
Area 190722249.77838
Altitude 18175.275149224

Triangular Pyramid

Length = n
Surface area 190722249.77838
Volume 1089393649675.2
Height 9893.3666778414