18520803 has 24 divisors (see below), whose sum is σ = 32374368. Its totient is φ = 9960192.

The previous prime is 18520793. The next prime is 18520829. The reversal of 18520803 is 30802581.

It is a happy number.

It is not a de Polignac number, because 18520803 - 2⁴ = 18520787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18520883) 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 in 23 ways as a sum of consecutive naturals, for example, 7576 + ... + 9717.

It is an arithmetic number, because the mean of its divisors is an integer number (1348932).

Almost surely, 2^18520803 is an apocalyptic number.

18520803 is a deficient number, since it is larger than the sum of its proper divisors (13853565).

18520803 is a wasteful number, since it uses less digits than its factorization.

18520803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17323 (or 17320 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 18520803 is about 4303.5802536958. The cubic root of 18520803 is about 264.5777207123.

The spelling of 18520803 in words is "eighteen million, five hundred twenty thousand, eight hundred three".