18720568 has 8 divisors (see below), whose sum is σ = 35101080. Its totient is φ = 9360280.

The previous prime is 18720563. The next prime is 18720571. The reversal of 18720568 is 86502781.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18720563) 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, 1170028 + ... + 1170043.

It is an arithmetic number, because the mean of its divisors is an integer number (4387635).

Almost surely, 2^18720568 is an apocalyptic number.

It is an amenable number.

18720568 is a deficient number, since it is larger than the sum of its proper divisors (16380512).

18720568 is a wasteful number, since it uses less digits than its factorization.

18720568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2340077 (or 2340073 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 18720568 is about 4326.7271695821. The cubic root of 18720568 is about 265.5255643130.

The spelling of 18720568 in words is "eighteen million, seven hundred twenty thousand, five hundred sixty-eight".