18820416 has 56 divisors (see below), whose sum is σ = 50438304. Its totient is φ = 6192640.

The previous prime is 18820397. The next prime is 18820421. The reversal of 18820416 is 61402881.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 15346 + ... + 16526.

It is an arithmetic number, because the mean of its divisors is an integer number (900684).

Almost surely, 2^18820416 is an apocalyptic number.

18820416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18820416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25219152).

18820416 is an abundant number, since it is smaller than the sum of its proper divisors (31617888).

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

18820416 is a wasteful number, since it uses less digits than its factorization.

18820416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279 (or 1269 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 18820416 is about 4338.2503385582. The cubic root of 18820416 is about 265.9967964640.

The spelling of 18820416 in words is "eighteen million, eight hundred twenty thousand, four hundred sixteen".