23420209 has 4 divisors (see below), whose sum is σ = 23468400. Its totient is φ = 23372020.

The previous prime is 23420207. The next prime is 23420213. The reversal of 23420209 is 90202432.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23420209 - 2¹ = 23420207 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23420209.

It is not an unprimeable number, because it can be changed into a prime (23420207) 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 3 ways as a sum of consecutive naturals, for example, 23359 + ... + 24340.

It is an arithmetic number, because the mean of its divisors is an integer number (5867100).

Almost surely, 2^23420209 is an apocalyptic number.

It is an amenable number.

23420209 is a deficient number, since it is larger than the sum of its proper divisors (48191).

23420209 is an equidigital number, since it uses as much as digits as its factorization.

23420209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48190.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 23420209 is about 4839.4430464672. The cubic root of 23420209 is about 286.1081673105.

The spelling of 23420209 in words is "twenty-three million, four hundred twenty thousand, two hundred nine".