18585820 has 24 divisors (see below), whose sum is σ = 42578928. Its totient is φ = 6758400.

The previous prime is 18585773. The next prime is 18585899. The reversal of 18585820 is 2858581.

It is a self number, because there is not a number n which added to its sum of digits gives 18585820.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 42021 + ... + 42460.

It is an arithmetic number, because the mean of its divisors is an integer number (1774122).

Almost surely, 2^18585820 is an apocalyptic number.

18585820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18585820 is an abundant number, since it is smaller than the sum of its proper divisors (23993108).

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

18585820 is a wasteful number, since it uses less digits than its factorization.

18585820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84501 (or 84499 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 37.

The square root of 18585820 is about 4311.1274627410. The cubic root of 18585820 is about 264.8869578380.

The spelling of 18585820 in words is "eighteen million, five hundred eighty-five thousand, eight hundred twenty".