16820825 has 24 divisors (see below), whose sum is σ = 23992512. Its totient is φ = 11459520.

The previous prime is 16820813. The next prime is 16820831. The reversal of 16820825 is 52802861.

It is not a de Polignac number, because 16820825 - 2⁶ = 16820761 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16820791 and 16820800.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48302 + ... + 48648.

It is an arithmetic number, because the mean of its divisors is an integer number (999688).

Almost surely, 2^16820825 is an apocalyptic number.

It is an amenable number.

16820825 is a deficient number, since it is larger than the sum of its proper divisors (7171687).

16820825 is a wasteful number, since it uses less digits than its factorization.

16820825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641 (or 636 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 16820825 is about 4101.3199094926. The cubic root of 16820825 is about 256.2216149403.

The spelling of 16820825 in words is "sixteen million, eight hundred twenty thousand, eight hundred twenty-five".