23420999 has 4 divisors (see below), whose sum is σ = 26766864. Its totient is φ = 20075136.

The previous prime is 23420933. The next prime is 23421001. The reversal of 23420999 is 99902432.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23420999 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 (23420599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1672922 + ... + 1672935.

It is an arithmetic number, because the mean of its divisors is an integer number (6691716).

Almost surely, 2^23420999 is an apocalyptic number.

23420999 is a deficient number, since it is larger than the sum of its proper divisors (3345865).

23420999 is an equidigital number, since it uses as much as digits as its factorization.

23420999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3345864.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 23420999 is about 4839.5246667416. The cubic root of 23420999 is about 286.1113842319. Note that the first 3 decimals are identical.

The spelling of 23420999 in words is "twenty-three million, four hundred twenty thousand, nine hundred ninety-nine".