18820408 has 16 divisors (see below), whose sum is σ = 35422560. Its totient is φ = 9374400.

The previous prime is 18820397. The next prime is 18820421. The reversal of 18820408 is 80402881.

It is a self number, because there is not a number n which added to its sum of digits gives 18820408.

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 3 ways as a sum of consecutive naturals, for example, 2173 + ... + 6508.

It is an arithmetic number, because the mean of its divisors is an integer number (2213910).

Almost surely, 2^18820408 is an apocalyptic number.

It is an amenable number.

18820408 is a deficient number, since it is larger than the sum of its proper divisors (16602152).

18820408 is a wasteful number, since it uses less digits than its factorization.

18820408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8958 (or 8954 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 31.

The square root of 18820408 is about 4338.2494165274. The cubic root of 18820408 is about 265.9967587748.

The spelling of 18820408 in words is "eighteen million, eight hundred twenty thousand, four hundred eight".