16920904 has 64 divisors (see below), whose sum is σ = 42618240. Its totient is φ = 6082560.

The previous prime is 16920901. The next prime is 16920979. The reversal of 16920904 is 40902961.

16920904 = T₃₃₇ + T₃₃₈ + ... + T₅₁₈.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (16920901) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 6952 + ... + 9064.

It is an arithmetic number, because the mean of its divisors is an integer number (665910).

Almost surely, 2^16920904 is an apocalyptic number.

16920904 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16920904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21309120).

16920904 is an abundant number, since it is smaller than the sum of its proper divisors (25697336).

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

16920904 is a wasteful number, since it uses less digits than its factorization.

16920904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2150 (or 2146 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 16920904 is about 4113.5026437332. The cubic root of 16920904 is about 256.7287584266.

The spelling of 16920904 in words is "sixteen million, nine hundred twenty thousand, nine hundred four".