18520475 has 12 divisors (see below), whose sum is σ = 23310264. Its totient is φ = 14593920.

The previous prime is 18520441. The next prime is 18520477. The reversal of 18520475 is 57402581.

It is not a de Polignac number, because 18520475 - 2¹⁶ = 18454939 is a prime.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18520477) 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 11 ways as a sum of consecutive naturals, for example, 3854 + ... + 7203.

It is an arithmetic number, because the mean of its divisors is an integer number (1942522).

Almost surely, 2^18520475 is an apocalyptic number.

18520475 is a deficient number, since it is larger than the sum of its proper divisors (4789789).

18520475 is a wasteful number, since it uses less digits than its factorization.

18520475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11134 (or 11129 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 18520475 is about 4303.5421457214. The cubic root of 18520475 is about 264.5761588289.

The spelling of 18520475 in words is "eighteen million, five hundred twenty thousand, four hundred seventy-five".