18705320 has 16 divisors (see below), whose sum is σ = 42087060. Its totient is φ = 7482112.

The previous prime is 18705317. The next prime is 18705341. The reversal of 18705320 is 2350781.

It can be written as a sum of positive squares in 2 ways, for example, as 18267076 + 438244 = 4274^2 + 662^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18705320.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 233777 + ... + 233856.

Almost surely, 2^18705320 is an apocalyptic number.

18705320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18705320 is an abundant number, since it is smaller than the sum of its proper divisors (23381740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18705320 is a wasteful number, since it uses less digits than its factorization.

18705320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467644 (or 467640 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 18705320 is about 4324.9647397407. The cubic root of 18705320 is about 265.4534540804.

The spelling of 18705320 in words is "eighteen million, seven hundred five thousand, three hundred twenty".