18705055 has 4 divisors (see below), whose sum is σ = 22446072. Its totient is φ = 14964040.

The previous prime is 18705053. The next prime is 18705073. The reversal of 18705055 is 55050781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55050781 = 1621 ⋅33961.

It is not a de Polignac number, because 18705055 - 2¹ = 18705053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18705053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1870501 + ... + 1870510.

It is an arithmetic number, because the mean of its divisors is an integer number (5611518).

Almost surely, 2^18705055 is an apocalyptic number.

18705055 is a deficient number, since it is larger than the sum of its proper divisors (3741017).

18705055 is an equidigital number, since it uses as much as digits as its factorization.

18705055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3741016.

The product of its (nonzero) digits is 7000, while the sum is 31.

The square root of 18705055 is about 4324.9341035442. The cubic root of 18705055 is about 265.4522005066.

The spelling of 18705055 in words is "eighteen million, seven hundred five thousand, fifty-five".