20856868 has 12 divisors (see below), whose sum is σ = 36841392. Its totient is φ = 10330760.

The previous prime is 20856839. The next prime is 20856877. The reversal of 20856868 is 86865802.

It is a happy number.

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, 23938 + ... + 24793.

It is an arithmetic number, because the mean of its divisors is an integer number (3070116).

Almost surely, 2^20856868 is an apocalyptic number.

It is an amenable number.

20856868 is a deficient number, since it is larger than the sum of its proper divisors (15984524).

20856868 is a wasteful number, since it uses less digits than its factorization.

20856868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48842 (or 48840 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 43.

The square root of 20856868 is about 4566.9320117558. The cubic root of 20856868 is about 275.2641780926.

The spelling of 20856868 in words is "twenty million, eight hundred fifty-six thousand, eight hundred sixty-eight".