18000580 has 24 divisors (see below), whose sum is σ = 40709592. Its totient is φ = 6646272.

The previous prime is 18000571. The next prime is 18000583. The reversal of 18000580 is 8500081.

It can be written as a sum of positive squares in 4 ways, for example, as 3968064 + 14032516 = 1992^2 + 3746^2 .

It is not an unprimeable number, because it can be changed into a prime (18000583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34357 + ... + 34876.

It is an arithmetic number, because the mean of its divisors is an integer number (1696233).

Almost surely, 2^18000580 is an apocalyptic number.

18000580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18000580 is an abundant number, since it is smaller than the sum of its proper divisors (22709012).

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

18000580 is a wasteful number, since it uses less digits than its factorization.

18000580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69255 (or 69253 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 18000580 is about 4242.7090402242. The cubic root of 18000580 is about 262.0769542610.

The spelling of 18000580 in words is "eighteen million, five hundred eighty", and thus it is an aban number.