16820904 has 16 divisors (see below), whose sum is σ = 42052320. Its totient is φ = 5606960.

The previous prime is 16820897. The next prime is 16820929. The reversal of 16820904 is 40902861.

It is a super-2 number, since 2×16820904² = 565885622754432, which contains 22 as substring.

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, 350412 + ... + 350459.

It is an arithmetic number, because the mean of its divisors is an integer number (2628270).

Almost surely, 2^16820904 is an apocalyptic number.

It is an amenable number.

16820904 is an abundant number, since it is smaller than the sum of its proper divisors (25231416).

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

16820904 is a wasteful number, since it uses less digits than its factorization.

16820904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700880 (or 700876 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 16820904 is about 4101.3295405271. The cubic root of 16820904 is about 256.2220160597. Note that the first 3 decimals are identical.

The spelling of 16820904 in words is "sixteen million, eight hundred twenty thousand, nine hundred four".