18820464 has 40 divisors (see below), whose sum is σ = 52361232. Its totient is φ = 5790720.

The previous prime is 18820453. The next prime is 18820481. The reversal of 18820464 is 46402881.

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, 14457 + ... + 15704.

Almost surely, 2^18820464 is an apocalyptic number.

It is an amenable number.

18820464 is an abundant number, since it is smaller than the sum of its proper divisors (33540768).

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

18820464 is a wasteful number, since it uses less digits than its factorization.

18820464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30185 (or 30179 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 18820464 is about 4338.2558707388. The cubic root of 18820464 is about 265.9970225984.

The spelling of 18820464 in words is "eighteen million, eight hundred twenty thousand, four hundred sixty-four".