20256311 has 16 divisors (see below), whose sum is σ = 21542400. Its totient is φ = 19027008.

The previous prime is 20256283. The next prime is 20256317. The reversal of 20256311 is 11365202.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20256311 is a prime.

It is a Duffinian number.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 227555 + ... + 227643.

It is an arithmetic number, because the mean of its divisors is an integer number (1346400).

Almost surely, 2^20256311 is an apocalyptic number.

20256311 is a deficient number, since it is larger than the sum of its proper divisors (1286089).

20256311 is an equidigital number, since it uses as much as digits as its factorization.

20256311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 20256311 is about 4500.7011675960. The cubic root of 20256311 is about 272.5964016580.

The spelling of 20256311 in words is "twenty million, two hundred fifty-six thousand, three hundred eleven".