20868716 has 12 divisors (see below), whose sum is σ = 39840360. Its totient is φ = 9485760.

The previous prime is 20868671. The next prime is 20868733. The reversal of 20868716 is 61786802.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20868716.

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, 237101 + ... + 237188.

It is an arithmetic number, because the mean of its divisors is an integer number (3320030).

Almost surely, 2^20868716 is an apocalyptic number.

It is an amenable number.

20868716 is a deficient number, since it is larger than the sum of its proper divisors (18971644).

20868716 is a wasteful number, since it uses less digits than its factorization.

20868716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474304 (or 474302 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 20868716 is about 4568.2289784992. The cubic root of 20868716 is about 275.3162906250.

The spelling of 20868716 in words is "twenty million, eight hundred sixty-eight thousand, seven hundred sixteen".