18705020385 has 16 divisors (see below), whose sum is σ = 29933262720. Its totient is φ = 9974267520.

The previous prime is 18705020371. The next prime is 18705020393. The reversal of 18705020385 is 58302050781.

It is not a de Polignac number, because 18705020385 - 2⁸ = 18705020129 is a prime.

It is a super-3 number, since 3×18705020385³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17805 + ... + 194234.

It is an arithmetic number, because the mean of its divisors is an integer number (1870828920).

Almost surely, 2^18705020385 is an apocalyptic number.

18705020385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18705020385 is a deficient number, since it is larger than the sum of its proper divisors (11228242335).

18705020385 is a wasteful number, since it uses less digits than its factorization.

18705020385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217928.

The product of its (nonzero) digits is 67200, while the sum is 39.

The spelling of 18705020385 in words is "eighteen billion, seven hundred five million, twenty thousand, three hundred eighty-five".