18329220 has 192 divisors, whose sum is σ = 70371840. Its totient is φ = 3856896.

The previous prime is 18329203. The next prime is 18329239. The reversal of 18329220 is 2292381.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 48954 + ... + 49326.

It is an arithmetic number, because the mean of its divisors is an integer number (366520).

Almost surely, 2^18329220 is an apocalyptic number.

18329220 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 18329220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35185920).

18329220 is an abundant number, since it is smaller than the sum of its proper divisors (52042620).

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

18329220 is a wasteful number, since it uses less digits than its factorization.

18329220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411 (or 403 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 18329220 is about 4281.2638320944. The cubic root of 18329220 is about 263.6622747566.

It can be divided in two parts, 183 and 29220, that added together give a triangular number (29403 = T₂₄₂).

The spelling of 18329220 in words is "eighteen million, three hundred twenty-nine thousand, two hundred twenty".