Base | Representation |
---|---|
bin | 100111100000… |
… | …0000010001111 |
3 | 1102222011010020 |
4 | 1033000002033 |
5 | 20300201034 |
6 | 2015513223 |
7 | 341012415 |
oct | 117000217 |
9 | 42864106 |
10 | 20709519 |
11 | 10765406 |
12 | 6b28813 |
13 | 43a136c |
14 | 2a712b5 |
15 | 1c41249 |
hex | 13c008f |
20709519 has 16 divisors (see below), whose sum is σ = 30182400. Its totient is φ = 12574080.
The previous prime is 20709511. The next prime is 20709523. The reversal of 20709519 is 91590702.
It is not a de Polignac number, because 20709519 - 23 = 20709511 is a prime.
It is a super-2 number, since 2×207095192 = 857768354422722, which contains 22 as substring.
It is a self number, because there is not a number n which added to its sum of digits gives 20709519.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (20709511) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4969 + ... + 8130.
It is an arithmetic number, because the mean of its divisors is an integer number (1886400).
Almost surely, 220709519 is an apocalyptic number.
20709519 is a deficient number, since it is larger than the sum of its proper divisors (9472881).
20709519 is a wasteful number, since it uses less digits than its factorization.
20709519 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 13150.
The product of its (nonzero) digits is 5670, while the sum is 33.
The square root of 20709519 is about 4550.7712533152. The cubic root of 20709519 is about 274.6144194054.
The spelling of 20709519 in words is "twenty million, seven hundred nine thousand, five hundred nineteen".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.025 sec. • engine limits •