20256856 has 8 divisors (see below), whose sum is σ = 37981620. Its totient is φ = 10128424.

The previous prime is 20256853. The next prime is 20256889. The reversal of 20256856 is 65865202.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20256851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1266046 + ... + 1266061.

Almost surely, 2^20256856 is an apocalyptic number.

It is an amenable number.

20256856 is a deficient number, since it is larger than the sum of its proper divisors (17724764).

20256856 is a wasteful number, since it uses less digits than its factorization.

20256856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2532113 (or 2532109 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 20256856 is about 4500.7617133103. The cubic root of 20256856 is about 272.5988463892.

It can be divided in two parts, 20256 and 856, that added together give a palindrome (21112).

The spelling of 20256856 in words is "twenty million, two hundred fifty-six thousand, eight hundred fifty-six".