20256256 has 20 divisors (see below), whose sum is σ = 40473972. Its totient is φ = 10127872.

The previous prime is 20256251. The next prime is 20256263. The reversal of 20256256 is 65265202.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20256251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19270 + ... + 20293.

Almost surely, 2^20256256 is an apocalyptic number.

It is an amenable number.

20256256 is a deficient number, since it is larger than the sum of its proper divisors (20217716).

20256256 is an frugal number, since it uses more digits than its factorization.

20256256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39581 (or 39565 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 20256256 is about 4500.6950574328. The cubic root of 20256256 is about 272.5961549396.

It can be divided in two parts, 2025 and 6256, that added together give a square (8281 = 91²).

The spelling of 20256256 in words is "twenty million, two hundred fifty-six thousand, two hundred fifty-six".