21808 (number)

21808 is an even 5-digits composite number following 21807 and preceding 21809. In scientific notation, it is written as 2.1808 × 10^4. The sum of its digits is 19. It has a total of 6 prime factors and 20 positive divisors. There are 10304 positive integers (up to 21808) that are relatively prime to 21808.

Interesting facts

Basic properties

Name

Name twenty-one thousand eight hundred eight

Notation

Scientific notation 2.1808 × 10^4
Engineering notation 2.1808 × 10^3

Prime Factorization of 21808

Prime Factorization 2 × 2 × 2 × 2 × 29 × 47

Composite number
ω Distinct Factors 3
Total number of distinct prime factors
Ω Total Factors 6
Total number of prime factors
rad Radical 2726
Product of the distinct prime numbers

The prime factorization of 21808 is 2 × 2 × 2 × 2 × 29 × 47. Since it has a total of 6 prime factors.

Most popular turbo-numbers

1, 3, 46, 97, 157, 343, 2164, 1215, 75550, 54315, 581782, 925301, 4203790, 4747658, 36903269, 58224137, 557637040, 777848023, 928037206, 5695437904

Basic calculations (n = 21808)

Multiplication

n×y
n×2 43616
n×3 65424
n×4 87232
n×5 109040

Division

n÷y
n÷2 10904
n÷3 7269.3333333333
n÷3 5452
n÷5 4361.6

Exponentiation

ny
n2 475588864
n3 10371641946112
n4 226184767560810496
n5 4.9326374109662E+21

Nth Root

y√n
2√n 147.6753195358
3√n 27.938641147394
4√n 12.15217344905
5√n 7.3743401776582

Divisors of 21808

1, 2, 4, 8, 16, 29, 47, 58, 94, 116, 188, 232, 376, 464, 752, 1363, 2726, 5452, 10904, 21808

20 divisors

τ Total Divisors 20
Total number of the positive divisors of n
σ Sum of Divisors 1
Sum of all the positive divisors of n
s Aliquot Sum -21807
Sum of the proper positive divisors of n
A Arithmetic Mean 0.05
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 20
Returns the total number of divisors (τ(n)) divided by the sum of the reciprocal of each divisors

The number 21808 can be divided by 20 positive divisors. The sum of these divisors (counting 21808) is 1, the average is 0.05.

Base conversion 21808

Base System Value
2 Binary 101010100110000
3 Ternary 1002220201
4 Quaternary 11110300
5 Quinary 1144213
6 Senary 244544
8 Octal 52460
10 Decimal 21808
12 Duodecimal 10754
16 Hexadecimal 5530
20 Vigesimal 2ea8
36 Base36 gts

Cryptographic Hash Functions

md5 cfdeefc98127480b07bd11d089e62bf2
sha1 35410b17c3159713aa20b7666cf862ff79e57515
sha256 761a44afda1291f7e75394a4a2499777180e3d7fe68418034c891e35fd80a188
sha512 b6a75f0c73b6ae9d2b83126beb4a1dc581310b70819cab3a1531b8a664739b3436d0292521abab6bf94717a09de5d88b16efee3bbe294d72d00feabead9540ad
ripemd-160 8299dcf5ecb081c12886d6d06590e28fd1e1097d

21808 as geometric shapes

Circle

Radius = n
Diameter 43616
Circumference 137023.70517897
Area 1494106481.2715

Sphere

Radius = n
Volume 43444632191426
Surface area 5976425925.0861
Circumference 137023.70517897

Square

Length = n
Perimeter 87232
Area 475588864
Diagonal 30841.169368232

Cube

Length = n
Surface area 2853533184
Volume 10371641946112
Space diagonal 37772.564011462

Equilateral Triangle

Length = n
Perimeter 65424
Area 205936018.99049
Altitude 18886.282005731

Triangular Pyramid

Length = n
Surface area 205936018.99049
Volume 1222309725355.8
Height 10280.389789411