16920872 has 16 divisors (see below), whose sum is σ = 31770900. Its totient is φ = 8448640.

The previous prime is 16920859. The next prime is 16920901. The reversal of 16920872 is 27802961.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13586596 + 3334276 = 3686^2 + 1826^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8972 + ... + 10692.

Almost surely, 2^16920872 is an apocalyptic number.

It is an amenable number.

16920872 is a deficient number, since it is larger than the sum of its proper divisors (14850028).

16920872 is a wasteful number, since it uses less digits than its factorization.

16920872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2956 (or 2952 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 16920872 is about 4113.4987541022. The cubic root of 16920872 is about 256.7285965888.

The spelling of 16920872 in words is "sixteen million, nine hundred twenty thousand, eight hundred seventy-two".