18228020 has 48 divisors (see below), whose sum is σ = 39664128. Its totient is φ = 7032960.

The previous prime is 18228017. The next prime is 18228059. The reversal of 18228020 is 2082281.

It is a congruent number.

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, 81629 + ... + 81851.

It is an arithmetic number, because the mean of its divisors is an integer number (826336).

Almost surely, 2^18228020 is an apocalyptic number.

18228020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18228020 is an abundant number, since it is smaller than the sum of its proper divisors (21436108).

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

18228020 is a wasteful number, since it uses less digits than its factorization.

18228020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360 (or 358 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 18228020 is about 4269.4285331880. The cubic root of 18228020 is about 263.1761314941.

The spelling of 18228020 in words is "eighteen million, two hundred twenty-eight thousand, twenty".