20985 (number)

20985 is an odd 5-digits composite number following 20984 and preceding 20986. In scientific notation, it is written as 2.0985 × 10^4. The sum of its digits is 24. It has a total of 3 prime factors and 8 positive divisors. There are 11184 positive integers (up to 20985) that are relatively prime to 20985.

Interesting facts

Basic properties

Name

Name twenty thousand nine hundred eighty-five

Notation

Scientific notation 2.0985 × 10^4
Engineering notation 2.0985 × 10^3

Prime Factorization of 20985

Prime Factorization 5 × 3 × 1399

Composite number
ω Distinct Factors 3
Total number of distinct prime factors
Ω Total Factors 3
Total number of prime factors
rad Radical 20985
Product of the distinct prime numbers

The prime factorization of 20985 is 5 × 3 × 1399. Since it has a total of 3 prime factors.

Most popular turbo-numbers

3, 2, 33, 11, 820, 107, 38, 7028, 18089, 56422, 310432, 503264, 483494, 2088922, 45908217, 13965660, 821313786, 91805153, 1446448590, 8380769292

Basic calculations (n = 20985)

Multiplication

n×y
n×2 41970
n×3 62955
n×4 83940
n×5 104925

Division

n÷y
n÷2 10492.5
n÷3 6995
n÷3 5246.25
n÷5 4197

Exponentiation

ny
n2 440370225
n3 9241169171625
n4 193925935066550625
n5 4.0695357473716E+21

Nth Root

y√n
2√n 144.86200329969
3√n 27.582671332088
4√n 12.035863213733
5√n 7.3178212128807

Divisors of 20985

1, 3, 5, 15, 1399, 4197, 6995, 20985

8 divisors

τ Total Divisors 8
Total number of the positive divisors of n
σ Sum of Divisors 1
Sum of all the positive divisors of n
s Aliquot Sum -20984
Sum of the proper positive divisors of n
A Arithmetic Mean 0.125
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 8
Returns the total number of divisors (τ(n)) divided by the sum of the reciprocal of each divisors

The number 20985 can be divided by 8 positive divisors. The sum of these divisors (counting 20985) is 1, the average is 0.125.

Base conversion 20985

Base System Value
2 Binary 101000111111001
3 Ternary 1001210020
4 Quaternary 11013321
5 Quinary 1132420
6 Senary 241053
8 Octal 50771
10 Decimal 20985
12 Duodecimal 10189
16 Hexadecimal 51f9
20 Vigesimal 2c95
36 Base36 g6x

Cryptographic Hash Functions

md5 874e32f9341fbd8141c45090f858e30b
sha1 838db7d27c4fa6fb3080095e1219ab96520b47f7
sha256 75199914535fa39f544215d1b4d64339a37b8cb9438f59827e298633aa397d96
sha512 216110f8f4c62b500d00b24ffa7cc4479d110ad1f9863b0f8d37b10cc3a7b547d15ae39ca24acb1102874da762baf5b1a3d72198c9e8dc565c203e5b6952b971
ripemd-160 841293b929ea63b22c025ed3dacf9397a94fc515

20985 as geometric shapes

Circle

Radius = n
Diameter 41970
Circumference 131852.64367116
Area 1383463863.7197

Sphere

Radius = n
Volume 38709318906877
Surface area 5533855454.8787
Circumference 131852.64367116

Square

Length = n
Perimeter 83940
Area 440370225
Diagonal 29677.271606399

Cube

Length = n
Surface area 2642221350
Volume 9241169171625
Space diagonal 36347.086196833

Equilateral Triangle

Length = n
Perimeter 62955
Area 190685900.96013
Altitude 18173.543098416

Triangular Pyramid

Length = n
Surface area 190685900.96013
Volume 1089082231224.7
Height 9892.4238687998