18820312 has 48 divisors (see below), whose sum is σ = 42086520. Its totient is φ = 7862400.

The previous prime is 18820301. The next prime is 18820313. The reversal of 18820312 is 21302881.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18820313) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 15487 + ... + 16657.

Almost surely, 2^18820312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18820312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21043260).

18820312 is an abundant number, since it is smaller than the sum of its proper divisors (23266208).

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

18820312 is a wasteful number, since it uses less digits than its factorization.

18820312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1232 (or 1221 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 18820312 is about 4338.2383521425. The cubic root of 18820312 is about 265.9963065046.

The spelling of 18820312 in words is "eighteen million, eight hundred twenty thousand, three hundred twelve".