21505280 is an even 8-digits composite number following 21505279
and preceding 21505281. In scientific notation, it is written as 2.1505280 × 10^7.
The sum of its digits is 23. It has a total of 11 prime factors and 72 positive divisors.
There are 8413184 positive integers (up to 21505280) that are relatively prime to 21505280.
Prime Factorization
2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 5 × 53 × 317
Composite number
| ω |
Distinct Factors |
4 |
Total number of distinct prime factors |
| Ω |
Total Factors |
11 |
Total number of prime factors |
| rad |
Radical |
168010 |
Product of the distinct prime numbers |
The prime factorization of 21505280 is 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 5 × 53 × 317.
Since it has a total of 11 prime factors.
1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 53, 64, 80, 106, 128, 160, 212, 256, 265, 317, 320, 424, 530, 634, 640, 848, 1060, 1268, 1280, 1585, 1696, 2120, 2536, 3170, 3392, 4240, 5072, 6340, 6784, 8480, 10144, 12680, 13568, 16801, 16960, 20288, 25360, 33602, 33920, 40576, 50720, 67204, 67840, 81152, 84005, 101440, 134408, 168010, 202880, 268816, 336020, 405760, 537632, 672040, 1075264, 1344080, 2150528, 2688160, 4301056, 5376320, 10752640, 21505280
72 divisors
| τ |
Total Divisors |
72 |
Total number of the positive divisors of n |
| σ |
Sum of Divisors |
1 |
Sum of all the positive divisors of n |
| s |
Aliquot Sum |
-21505279 |
Sum of the proper positive divisors of n |
| A |
Arithmetic Mean |
0.013888888888889 |
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 |
72 |
Returns the total number of divisors (τ(n)) divided by the sum of the reciprocal of each divisors |
The number 21505280 can be divided by 72 positive divisors.
The sum of these divisors (counting 21505280) is 1, the average is 0.013888888888889.