22720879 has 4 divisors (see below), whose sum is σ = 22735120. Its totient is φ = 22706640.

The previous prime is 22720843. The next prime is 22720889. The reversal of 22720879 is 97802722.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22720879 - 2¹⁷ = 22589807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22720829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4374 + ... + 8035.

It is an arithmetic number, because the mean of its divisors is an integer number (5683780).

Almost surely, 2^22720879 is an apocalyptic number.

22720879 is a deficient number, since it is larger than the sum of its proper divisors (14241).

22720879 is a wasteful number, since it uses less digits than its factorization.

22720879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14240.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 22720879 is about 4766.6423192851. The cubic root of 22720879 is about 283.2316025398.

The spelling of 22720879 in words is "twenty-two million, seven hundred twenty thousand, eight hundred seventy-nine".