20996256 has 24 divisors (see below), whose sum is σ = 55115424. Its totient is φ = 6998720.

The previous prime is 20996251. The next prime is 20996293. The reversal of 20996256 is 65269902.

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (20996251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109260 + ... + 109451.

It is an arithmetic number, because the mean of its divisors is an integer number (2296476).

Almost surely, 2^20996256 is an apocalyptic number.

It is an amenable number.

20996256 is an abundant number, since it is smaller than the sum of its proper divisors (34119168).

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

20996256 is a wasteful number, since it uses less digits than its factorization.

20996256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218724 (or 218716 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 20996256 is about 4582.1671728561. The cubic root of 20996256 is about 275.8760207714.

The spelling of 20996256 in words is "twenty million, nine hundred ninety-six thousand, two hundred fifty-six".