18329820 has 24 divisors (see below), whose sum is σ = 51323664. Its totient is φ = 4887936.

The previous prime is 18329809. The next prime is 18329833. The reversal of 18329820 is 2892381.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152689 + ... + 152808.

It is an arithmetic number, because the mean of its divisors is an integer number (2138486).

Almost surely, 2^18329820 is an apocalyptic number.

18329820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18329820 is an abundant number, since it is smaller than the sum of its proper divisors (32993844).

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

18329820 is a wasteful number, since it uses less digits than its factorization.

18329820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305509 (or 305507 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 18329820 is about 4281.3339042873. Note that the first 3 decimals coincide. The cubic root of 18329820 is about 263.6651516865.

It can be divided in two parts, 183 and 29820, that added together give a palindrome (30003).

The spelling of 18329820 in words is "eighteen million, three hundred twenty-nine thousand, eight hundred twenty".