18805105 has 8 divisors (see below), whose sum is σ = 24617664. Its totient is φ = 13676400.

The previous prime is 18805097. The next prime is 18805109. The reversal of 18805105 is 50150881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18805105 - 2³ = 18805097 is a prime.

It is a super-2 number, since 2×18805105² = 707263948122050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18805109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170901 + ... + 171010.

It is an arithmetic number, because the mean of its divisors is an integer number (3077208).

Almost surely, 2^18805105 is an apocalyptic number.

It is an amenable number.

18805105 is a deficient number, since it is larger than the sum of its proper divisors (5812559).

18805105 is a wasteful number, since it uses less digits than its factorization.

18805105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341927.

The product of its (nonzero) digits is 1600, while the sum is 28.

The square root of 18805105 is about 4336.4853280047. The cubic root of 18805105 is about 265.9246446428.

Adding to 18805105 its reverse (50150881), we get a palindrome (68955986).

The spelling of 18805105 in words is "eighteen million, eight hundred five thousand, one hundred five".