23420042 has 4 divisors (see below), whose sum is σ = 35130066. Its totient is φ = 11710020.

The previous prime is 23420039. The next prime is 23420069. The reversal of 23420042 is 24002432.

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., 15062161 + 8357881 = 3881^2 + 2891^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 23420042.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5855009 + ... + 5855012.

Almost surely, 2^23420042 is an apocalyptic number.

23420042 is a deficient number, since it is larger than the sum of its proper divisors (11710024).

23420042 is a wasteful number, since it uses less digits than its factorization.

23420042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11710023.

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 23420042 is about 4839.4257923849. The cubic root of 23420042 is about 286.1074872685.

Adding to 23420042 its reverse (24002432), we get a palindrome (47422474).

The spelling of 23420042 in words is "twenty-three million, four hundred twenty thousand, forty-two".