18720063 has 24 divisors (see below), whose sum is σ = 28129920. Its totient is φ = 11983680.

The previous prime is 18719983. The next prime is 18720083. The reversal of 18720063 is 36002781.

It is not a de Polignac number, because 18720063 - 2¹⁰ = 18719039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18720083) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63745 + ... + 64037.

It is an arithmetic number, because the mean of its divisors is an integer number (1172080).

Almost surely, 2^18720063 is an apocalyptic number.

18720063 is a deficient number, since it is larger than the sum of its proper divisors (9409857).

18720063 is a wasteful number, since it uses less digits than its factorization.

18720063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559 (or 556 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 18720063 is about 4326.6688109907. The cubic root of 18720063 is about 265.5231767142.

The spelling of 18720063 in words is "eighteen million, seven hundred twenty thousand, sixty-three".