20872816 has 10 divisors (see below), whose sum is σ = 40441112. Its totient is φ = 10436400.

The previous prime is 20872807. The next prime is 20872853. The reversal of 20872816 is 61827802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652260 + ... + 652291.

Almost surely, 2^20872816 is an apocalyptic number.

It is an amenable number.

20872816 is a deficient number, since it is larger than the sum of its proper divisors (19568296).

20872816 is a wasteful number, since it uses less digits than its factorization.

20872816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1304559 (or 1304553 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 20872816 is about 4568.6777080464. The cubic root of 20872816 is about 275.3343195713.

The spelling of 20872816 in words is "twenty million, eight hundred seventy-two thousand, eight hundred sixteen".