23720042 has 4 divisors (see below), whose sum is σ = 35580066. Its totient is φ = 11860020.

The previous prime is 23720027. The next prime is 23720063. The reversal of 23720042 is 24002732.

It is a happy number.

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., 19439281 + 4280761 = 4409^2 + 2069^2 .

It is a junction number, because it is equal to n+sod(n) for n = 23719996 and 23720023.

It is an unprimeable number.

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, 5930009 + ... + 5930012.

Almost surely, 2^23720042 is an apocalyptic number.

23720042 is a deficient number, since it is larger than the sum of its proper divisors (11860024).

23720042 is a wasteful number, since it uses less digits than its factorization.

23720042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11860023.

The product of its (nonzero) digits is 672, while the sum is 20.

The square root of 23720042 is about 4870.3225765857. The cubic root of 23720042 is about 287.3239431234.

Adding to 23720042 its reverse (24002732), we get a palindrome (47722774).

The spelling of 23720042 in words is "twenty-three million, seven hundred twenty thousand, forty-two".