18520530 has 96 divisors (see below), whose sum is σ = 53089344. Its totient is φ = 4120704.

The previous prime is 18520493. The next prime is 18520553. The reversal of 18520530 is 3502581.

It is a self number, because there is not a number n which added to its sum of digits gives 18520530.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 63064 + ... + 63356.

It is an arithmetic number, because the mean of its divisors is an integer number (553014).

Almost surely, 2^18520530 is an apocalyptic number.

18520530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18520530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26544672).

18520530 is an abundant number, since it is smaller than the sum of its proper divisors (34568814).

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

18520530 is a wasteful number, since it uses less digits than its factorization.

18520530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360 (or 353 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 18520530 is about 4303.5485358016. The cubic root of 18520530 is about 264.5764207314.

The spelling of 18520530 in words is "eighteen million, five hundred twenty thousand, five hundred thirty".