18520540 has 12 divisors (see below), whose sum is σ = 38893176. Its totient is φ = 7408208.

The previous prime is 18520493. The next prime is 18520553. The reversal of 18520540 is 4502581.

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 3 ways as a sum of consecutive naturals, for example, 462994 + ... + 463033.

It is an arithmetic number, because the mean of its divisors is an integer number (3241098).

Almost surely, 2^18520540 is an apocalyptic number.

18520540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18520540 is an abundant number, since it is smaller than the sum of its proper divisors (20372636).

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

18520540 is a wasteful number, since it uses less digits than its factorization.

18520540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926036 (or 926034 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 18520540 is about 4303.5496976333. The cubic root of 18520540 is about 264.5764683499.

The spelling of 18520540 in words is "eighteen million, five hundred twenty thousand, five hundred forty".