16720864 has 24 divisors (see below), whose sum is σ = 33543720. Its totient is φ = 8201856.

The previous prime is 16720859. The next prime is 16720871. The reversal of 16720864 is 46802761.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3234 + ... + 6625.

It is an arithmetic number, because the mean of its divisors is an integer number (1397655).

Almost surely, 2^16720864 is an apocalyptic number.

It is an amenable number.

16720864 is an abundant number, since it is smaller than the sum of its proper divisors (16822856).

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

16720864 is an equidigital number, since it uses as much as digits as its factorization.

16720864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9922 (or 9914 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 16720864 is about 4089.1153077408. The cubic root of 16720864 is about 255.7130574012.

The spelling of 16720864 in words is "sixteen million, seven hundred twenty thousand, eight hundred sixty-four".