16820256 has 24 divisors (see below), whose sum is σ = 44153424. Its totient is φ = 5606720.

The previous prime is 16820249. The next prime is 16820273. The reversal of 16820256 is 65202861.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87510 + ... + 87701.

It is an arithmetic number, because the mean of its divisors is an integer number (1839726).

Almost surely, 2^16820256 is an apocalyptic number.

16820256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

16820256 is an abundant number, since it is smaller than the sum of its proper divisors (27333168).

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

16820256 is a wasteful number, since it uses less digits than its factorization.

16820256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175224 (or 175216 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 16820256 is about 4101.2505409936. The cubic root of 16820256 is about 256.2187258283.

The spelling of 16820256 in words is "sixteen million, eight hundred twenty thousand, two hundred fifty-six".