18425220 has 48 divisors (see below), whose sum is σ = 56282688. Its totient is φ = 4466560.

The previous prime is 18425207. The next prime is 18425221. The reversal of 18425220 is 2252481.

It is not an unprimeable number, because it can be changed into a prime (18425221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13299 + ... + 14618.

It is an arithmetic number, because the mean of its divisors is an integer number (1172556).

Almost surely, 2^18425220 is an apocalyptic number.

18425220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18425220 is an abundant number, since it is smaller than the sum of its proper divisors (37857468).

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

18425220 is a wasteful number, since it uses less digits than its factorization.

18425220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27940 (or 27938 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 18425220 is about 4292.4608326693. The cubic root of 18425220 is about 264.1217872434.

The spelling of 18425220 in words is "eighteen million, four hundred twenty-five thousand, two hundred twenty".