18006580 has 12 divisors (see below), whose sum is σ = 37813860. Its totient is φ = 7202624.

The previous prime is 18006559. The next prime is 18006613. The reversal of 18006580 is 8560081.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10575504 + 7431076 = 3252^2 + 2726^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 450145 + ... + 450184.

It is an arithmetic number, because the mean of its divisors is an integer number (3151155).

Almost surely, 2^18006580 is an apocalyptic number.

18006580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18006580 is an abundant number, since it is smaller than the sum of its proper divisors (19807280).

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

18006580 is a wasteful number, since it uses less digits than its factorization.

18006580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900338 (or 900336 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 18006580 is about 4243.4160767005. The cubic root of 18006580 is about 262.1060697496.

The spelling of 18006580 in words is "eighteen million, six thousand, five hundred eighty".