16820331 has 12 divisors (see below), whose sum is σ = 24651816. Its totient is φ = 10193920.

The previous prime is 16820317. The next prime is 16820333. The reversal of 16820331 is 13302861.

It is not a de Polignac number, because 16820331 - 2⁵ = 16820299 is a prime.

It is a super-2 number, since 2×16820331² = 565847069899122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16820333) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22806 + ... + 23531.

It is an arithmetic number, because the mean of its divisors is an integer number (2054318).

Almost surely, 2^16820331 is an apocalyptic number.

16820331 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16820331 is a deficient number, since it is larger than the sum of its proper divisors (7831485).

16820331 is a wasteful number, since it uses less digits than its factorization.

16820331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46362 (or 46351 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 16820331 is about 4101.2596845360. The cubic root of 16820331 is about 256.2191066465.

The spelling of 16820331 in words is "sixteen million, eight hundred twenty thousand, three hundred thirty-one".