20856814 has 32 divisors (see below), whose sum is σ = 36412416. Its totient is φ = 8865120.

The previous prime is 20856793. The next prime is 20856827. The reversal of 20856814 is 41865802.

It is a self number, because there is not a number n which added to its sum of digits gives 20856814.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23344 + ... + 24220.

It is an arithmetic number, because the mean of its divisors is an integer number (1137888).

Almost surely, 2^20856814 is an apocalyptic number.

20856814 is a deficient number, since it is larger than the sum of its proper divisors (15555602).

20856814 is a wasteful number, since it uses less digits than its factorization.

20856814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 20856814 is about 4566.9260996867. The cubic root of 20856814 is about 275.2639405325.

The spelling of 20856814 in words is "twenty million, eight hundred fifty-six thousand, eight hundred fourteen".