20308539 has 8 divisors (see below), whose sum is σ = 27207232. Its totient is φ = 13474440.

The previous prime is 20308529. The next prime is 20308543. The reversal of 20308539 is 93580302.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20308539 - 2⁵ = 20308507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20308529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15409 + ... + 16674.

It is an arithmetic number, because the mean of its divisors is an integer number (3400904).

Almost surely, 2^20308539 is an apocalyptic number.

20308539 is a deficient number, since it is larger than the sum of its proper divisors (6898693).

20308539 is a wasteful number, since it uses less digits than its factorization.

20308539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32297.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 20308539 is about 4506.4996394097. The cubic root of 20308539 is about 272.8304841981.

The spelling of 20308539 in words is "twenty million, three hundred eight thousand, five hundred thirty-nine".