23520809 has 16 divisors (see below), whose sum is σ = 27216000. Its totient is φ = 20133120.

The previous prime is 23520793. The next prime is 23520811. The reversal of 23520809 is 90802532.

It is a cyclic number.

It is not a de Polignac number, because 23520809 - 2⁴ = 23520793 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (23520859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14942 + ... + 16440.

It is an arithmetic number, because the mean of its divisors is an integer number (1701000).

Almost surely, 2^23520809 is an apocalyptic number.

It is an amenable number.

23520809 is a deficient number, since it is larger than the sum of its proper divisors (3695191).

23520809 is a wasteful number, since it uses less digits than its factorization.

23520809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1600.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 23520809 is about 4849.8256669699. The cubic root of 23520809 is about 286.5172352312.

The spelling of 23520809 in words is "twenty-three million, five hundred twenty thousand, eight hundred nine".