20256656 has 40 divisors (see below), whose sum is σ = 47496960. Its totient is φ = 8169984.

The previous prime is 20256637. The next prime is 20256659. The reversal of 20256656 is 65665202.

It is a super-3 number, since 3×20256656³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (20256659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3416 + ... + 7223.

It is an arithmetic number, because the mean of its divisors is an integer number (1187424).

Almost surely, 2^20256656 is an apocalyptic number.

It is an amenable number.

20256656 is an abundant number, since it is smaller than the sum of its proper divisors (27240304).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20256656 is a wasteful number, since it uses less digits than its factorization.

20256656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10671 (or 10665 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 20256656 is about 4500.7394947942. The cubic root of 20256656 is about 272.5979492452.

The spelling of 20256656 in words is "twenty million, two hundred fifty-six thousand, six hundred fifty-six".