18081580 has 24 divisors (see below), whose sum is σ = 41423760. Its totient is φ = 6575040.

The previous prime is 18081563. The next prime is 18081593. The reversal of 18081580 is 8518081.

It is a happy number.

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, 40875 + ... + 41314.

It is an arithmetic number, because the mean of its divisors is an integer number (1725990).

Almost surely, 2^18081580 is an apocalyptic number.

18081580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18081580 is an abundant number, since it is smaller than the sum of its proper divisors (23342180).

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

18081580 is a wasteful number, since it uses less digits than its factorization.

18081580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82209 (or 82207 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 31.

The square root of 18081580 is about 4252.2441134065. The cubic root of 18081580 is about 262.4694688603.

The spelling of 18081580 in words is "eighteen million, eighty-one thousand, five hundred eighty".