16564220 has 24 divisors (see below), whose sum is σ = 35985600. Its totient is φ = 6396992.

The previous prime is 16564193. The next prime is 16564237. The reversal of 16564220 is 2246561.

It is a self number, because there is not a number n which added to its sum of digits gives 16564220.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13700 + ... + 14859.

It is an arithmetic number, because the mean of its divisors is an integer number (1499400).

Almost surely, 2^16564220 is an apocalyptic number.

16564220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16564220 is an abundant number, since it is smaller than the sum of its proper divisors (19421380).

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

16564220 is a wasteful number, since it uses less digits than its factorization.

16564220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28597 (or 28595 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 16564220 is about 4069.9164610591. The cubic root of 16564220 is about 254.9120291193.

The spelling of 16564220 in words is "sixteen million, five hundred sixty-four thousand, two hundred twenty".