18205240 has 32 divisors (see below), whose sum is σ = 41579280. Its totient is φ = 7172352.

The previous prime is 18205237. The next prime is 18205241. The reversal of 18205240 is 4250281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18205241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 717 + ... + 6076.

Almost surely, 2^18205240 is an apocalyptic number.

18205240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18205240 is an abundant number, since it is smaller than the sum of its proper divisors (23374040).

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

18205240 is a wasteful number, since it uses less digits than its factorization.

18205240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6871 (or 6867 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 18205240 is about 4266.7598948148. The cubic root of 18205240 is about 263.0664532544.

The spelling of 18205240 in words is "eighteen million, two hundred five thousand, two hundred forty".