18330320 has 40 divisors (see below), whose sum is σ = 44093160. Its totient is φ = 7078400.

The previous prime is 18330293. The next prime is 18330353. The reversal of 18330320 is 2303381.

It can be written as a sum of positive squares in 4 ways, for example, as 3182656 + 15147664 = 1784^2 + 3892^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 18330292 and 18330301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1631 + ... + 6270.

It is an arithmetic number, because the mean of its divisors is an integer number (1102329).

Almost surely, 2^18330320 is an apocalyptic number.

18330320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18330320 is an abundant number, since it is smaller than the sum of its proper divisors (25762840).

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

18330320 is a wasteful number, since it uses less digits than its factorization.

18330320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7943 (or 7937 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 18330320 is about 4281.3922969053. The cubic root of 18330320 is about 263.6675490800.

It can be divided in two parts, 183 and 30320, that added together give a palindrome (30503).

The spelling of 18330320 in words is "eighteen million, three hundred thirty thousand, three hundred twenty".