16559920 has 40 divisors (see below), whose sum is σ = 41466096. Its totient is φ = 6114048.

The previous prime is 16559897. The next prime is 16559923. The reversal of 16559920 is 2995561.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 16559920.

It is not an unprimeable number, because it can be changed into a prime (16559923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6922 + ... + 9001.

Almost surely, 2^16559920 is an apocalyptic number.

16559920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16559920 is an abundant number, since it is smaller than the sum of its proper divisors (24906176).

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

16559920 is a wasteful number, since it uses less digits than its factorization.

16559920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15949 (or 15943 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 16559920 is about 4069.3881603995. The cubic root of 16559920 is about 254.8899691895.

The spelling of 16559920 in words is "sixteen million, five hundred fifty-nine thousand, nine hundred twenty".