20271256 has 16 divisors (see below), whose sum is σ = 38467800. Its totient is φ = 10013184.

The previous prime is 20271239. The next prime is 20271289. The reversal of 20271256 is 65217202.

It is a self number, because there is not a number n which added to its sum of digits gives 20271256.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14601 + ... + 15928.

Almost surely, 2^20271256 is an apocalyptic number.

It is an amenable number.

20271256 is a deficient number, since it is larger than the sum of its proper divisors (18196544).

20271256 is a wasteful number, since it uses less digits than its factorization.

20271256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30618 (or 30614 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 20271256 is about 4502.3611583257. The cubic root of 20271256 is about 272.6634252425.

Adding to 20271256 its reverse (65217202), we get a palindrome (85488458).

The spelling of 20271256 in words is "twenty million, two hundred seventy-one thousand, two hundred fifty-six".