23920509 has 8 divisors (see below), whose sum is σ = 32572800. Its totient is φ = 15607616.

The previous prime is 23920493. The next prime is 23920531. The reversal of 23920509 is 90502932.

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

It is a cyclic number.

It is not a de Polignac number, because 23920509 - 2⁴ = 23920493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23920909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84684 + ... + 84965.

It is an arithmetic number, because the mean of its divisors is an integer number (4071600).

Almost surely, 2^23920509 is an apocalyptic number.

It is an amenable number.

23920509 is a deficient number, since it is larger than the sum of its proper divisors (8652291).

23920509 is a wasteful number, since it uses less digits than its factorization.

23920509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169699.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 23920509 is about 4890.8597403729. The cubic root of 23920509 is about 288.1311010953.

The spelling of 23920509 in words is "twenty-three million, nine hundred twenty thousand, five hundred nine".