22720539 has 8 divisors (see below), whose sum is σ = 30451792. Its totient is φ = 15068160.

The previous prime is 22720531. The next prime is 22720541. The reversal of 22720539 is 93502722.

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 22720539 - 2³ = 22720531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22720531) 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, 19042 + ... + 20199.

It is an arithmetic number, because the mean of its divisors is an integer number (3806474).

Almost surely, 2^22720539 is an apocalyptic number.

22720539 is a deficient number, since it is larger than the sum of its proper divisors (7731253).

22720539 is a wasteful number, since it uses less digits than its factorization.

22720539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39437.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 22720539 is about 4766.6066546339. The cubic root of 22720539 is about 283.2301897538.

The spelling of 22720539 in words is "twenty-two million, seven hundred twenty thousand, five hundred thirty-nine".