20256313 has 16 divisors (see below), whose sum is σ = 25353216. Its totient is φ = 15722640.

The previous prime is 20256283. The next prime is 20256317. The reversal of 20256313 is 31365202.

It is a cyclic number.

It is not a de Polignac number, because 20256313 - 2⁵ = 20256281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20256317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38470 + ... + 38992.

It is an arithmetic number, because the mean of its divisors is an integer number (1584576).

Almost surely, 2^20256313 is an apocalyptic number.

It is an amenable number.

20256313 is a deficient number, since it is larger than the sum of its proper divisors (5096903).

20256313 is a wasteful number, since it uses less digits than its factorization.

20256313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 20256313 is about 4500.7013897836. The cubic root of 20256313 is about 272.5964106296.

Subtracting 20256313 from its reverse (31365202), we obtain a square (11108889 = 3333²).

It can be divided in two parts, 2025 and 6313, that added together give a palindrome (8338).

The spelling of 20256313 in words is "twenty million, two hundred fifty-six thousand, three hundred thirteen".