Base | Representation |
---|---|
bin | 100110011010… |
… | …0110000010111 |
3 | 1101220011120001 |
4 | 1030310300113 |
5 | 20123422111 |
6 | 1555352131 |
7 | 333115243 |
oct | 114646027 |
9 | 41804501 |
10 | 20139031 |
11 | 10405830 |
12 | 68b2647 |
13 | 42317b3 |
14 | 2963423 |
15 | 1b7c1c1 |
hex | 1334c17 |
20139031 has 16 divisors (see below), whose sum is σ = 23304960. Its totient is φ = 17210880.
The previous prime is 20139019. The next prime is 20139109. The reversal of 20139031 is 13093102.
20139031 is a nontrivial binomial coefficient, being equal to C(6347, 2).
It is a cyclic number.
It is not a de Polignac number, because 20139031 - 27 = 20138903 is a prime.
It is a super-2 number, since 2×201390312 = 811161139237922, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (19).
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (20139011) 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, 34615 + ... + 35191.
It is an arithmetic number, because the mean of its divisors is an integer number (1456560).
Almost surely, 220139031 is an apocalyptic number.
20139031 is the 6346-th triangular number.
20139031 is the 2116-th centered nonagonal number.
20139031 is a deficient number, since it is larger than the sum of its proper divisors (3165929).
20139031 is a wasteful number, since it uses less digits than its factorization.
20139031 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 774.
The product of its (nonzero) digits is 162, while the sum is 19.
The square root of 20139031 is about 4487.6531728733. The cubic root of 20139031 is about 272.0692901256.
The spelling of 20139031 in words is "twenty million, one hundred thirty-nine thousand, thirty-one".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.067 sec. • engine limits •