18021560 has 32 divisors (see below), whose sum is σ = 40772160. Its totient is φ = 7168896.

The previous prime is 18021529. The next prime is 18021569. The reversal of 18021560 is 6512081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18021569) by changing a digit.

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, 6737 + ... + 9023.

It is an arithmetic number, because the mean of its divisors is an integer number (1274130).

Almost surely, 2^18021560 is an apocalyptic number.

18021560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18021560 is an abundant number, since it is smaller than the sum of its proper divisors (22750600).

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

18021560 is a wasteful number, since it uses less digits than its factorization.

18021560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2495 (or 2491 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 18021560 is about 4245.1807970922. The cubic root of 18021560 is about 262.1787331987.

It can be divided in two parts, 18021 and 560, that added together give a palindrome (18581).

The spelling of 18021560 in words is "eighteen million, twenty-one thousand, five hundred sixty".