18328620 has 24 divisors (see below), whose sum is σ = 51320304. Its totient is φ = 4887616.

The previous prime is 18328613. The next prime is 18328627. The reversal of 18328620 is 2682381.

It is an interprime number because it is at equal distance from previous prime (18328613) and next prime (18328627).

It is a super-2 number, since 2×18328620² = 671876622208800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (18328627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152679 + ... + 152798.

It is an arithmetic number, because the mean of its divisors is an integer number (2138346).

Almost surely, 2^18328620 is an apocalyptic number.

18328620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18328620 is an abundant number, since it is smaller than the sum of its proper divisors (32991684).

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

18328620 is a wasteful number, since it uses less digits than its factorization.

18328620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305489 (or 305487 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 18328620 is about 4281.1937587547. The cubic root of 18328620 is about 263.6593977640.

The spelling of 18328620 in words is "eighteen million, three hundred twenty-eight thousand, six hundred twenty".