18525220 has 48 divisors (see below), whose sum is σ = 44892288. Its totient is φ = 6289920.

The previous prime is 18525203. The next prime is 18525239. The reversal of 18525220 is 2252581.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15235 + ... + 16405.

It is an arithmetic number, because the mean of its divisors is an integer number (935256).

Almost surely, 2^18525220 is an apocalyptic number.

18525220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18525220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22446144).

18525220 is an abundant number, since it is smaller than the sum of its proper divisors (26367068).

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

18525220 is a wasteful number, since it uses less digits than its factorization.

18525220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1300 (or 1298 counting only the distinct ones).

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

The square root of 18525220 is about 4304.0934004736. The cubic root of 18525220 is about 264.5987519621.

The spelling of 18525220 in words is "eighteen million, five hundred twenty-five thousand, two hundred twenty".