16720664 has 16 divisors (see below), whose sum is σ = 31491600. Its totient is φ = 8322912.

The previous prime is 16720663. The next prime is 16720667. The reversal of 16720664 is 46602761.

It is a self number, because there is not a number n which added to its sum of digits gives 16720664.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16720663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2732 + ... + 6395.

It is an arithmetic number, because the mean of its divisors is an integer number (1968225).

Almost surely, 2^16720664 is an apocalyptic number.

It is an amenable number.

16720664 is a deficient number, since it is larger than the sum of its proper divisors (14770936).

16720664 is a wasteful number, since it uses less digits than its factorization.

16720664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9362 (or 9358 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 16720664 is about 4089.0908525001. The cubic root of 16720664 is about 255.7120378603.

The spelling of 16720664 in words is "sixteen million, seven hundred twenty thousand, six hundred sixty-four".