23420018 has 4 divisors (see below), whose sum is σ = 35130030. Its totient is φ = 11710008.

The previous prime is 23420017. The next prime is 23420021. The reversal of 23420018 is 81002432.

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

It can be written as a sum of positive squares in only one way, i.e., 14160169 + 9259849 = 3763^2 + 3043^2 .

It is not an unprimeable number, because it can be changed into a prime (23420017) 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 as a sum of consecutive naturals, namely, 5855003 + ... + 5855006.

Almost surely, 2^23420018 is an apocalyptic number.

23420018 is a deficient number, since it is larger than the sum of its proper divisors (11710012).

23420018 is a wasteful number, since it uses less digits than its factorization.

23420018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11710011.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 23420018 is about 4839.4233127512. The cubic root of 23420018 is about 286.1073895377.

The spelling of 23420018 in words is "twenty-three million, four hundred twenty thousand, eighteen".