18802820 has 48 divisors (see below), whose sum is σ = 40981248. Its totient is φ = 7242240.

The previous prime is 18802811. The next prime is 18802853. The reversal of 18802820 is 2820881.

18802820 is a modest number, since divided by 2820 gives 1880 as remainder.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77900 + ... + 78140.

It is an arithmetic number, because the mean of its divisors is an integer number (853776).

Almost surely, 2^18802820 is an apocalyptic number.

18802820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18802820 is an abundant number, since it is smaller than the sum of its proper divisors (22178428).

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

18802820 is a wasteful number, since it uses less digits than its factorization.

18802820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380 (or 378 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 29.

The square root of 18802820 is about 4336.2218577928. The cubic root of 18802820 is about 265.9138734112.

The spelling of 18802820 in words is "eighteen million, eight hundred two thousand, eight hundred twenty".