18528220 has 12 divisors (see below), whose sum is σ = 38909304. Its totient is φ = 7411280.

The previous prime is 18528197. The next prime is 18528221. The reversal of 18528220 is 2282581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18528221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 463186 + ... + 463225.

It is an arithmetic number, because the mean of its divisors is an integer number (3242442).

Almost surely, 2^18528220 is an apocalyptic number.

18528220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18528220 is an abundant number, since it is smaller than the sum of its proper divisors (20381084).

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

18528220 is a wasteful number, since it uses less digits than its factorization.

18528220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926420 (or 926418 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 18528220 is about 4304.4418918136. The cubic root of 18528220 is about 264.6130343549.

The spelling of 18528220 in words is "eighteen million, five hundred twenty-eight thousand, two hundred twenty".