18806305 has 16 divisors (see below), whose sum is σ = 26625024. Its totient is φ = 12479040.

The previous prime is 18806303. The next prime is 18806339. The reversal of 18806305 is 50360881.

It is not a de Polignac number, because 18806305 - 2¹ = 18806303 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18806303) 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 15 ways as a sum of consecutive naturals, for example, 7582 + ... + 9751.

It is an arithmetic number, because the mean of its divisors is an integer number (1664064).

Almost surely, 2^18806305 is an apocalyptic number.

It is an amenable number.

18806305 is a deficient number, since it is larger than the sum of its proper divisors (7818719).

18806305 is a wasteful number, since it uses less digits than its factorization.

18806305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17376.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 18806305 is about 4336.6236866945. The cubic root of 18806305 is about 265.9303009577.

The spelling of 18806305 in words is "eighteen million, eight hundred six thousand, three hundred five".