20560256 has 16 divisors (see below), whose sum is σ = 40960140. Its totient is φ = 10280064.

The previous prime is 20560247. The next prime is 20560273. The reversal of 20560256 is 65206502.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80186 + ... + 80441.

Almost surely, 2^20560256 is an apocalyptic number.

It is an amenable number.

20560256 is a deficient number, since it is larger than the sum of its proper divisors (20399884).

20560256 is an equidigital number, since it uses as much as digits as its factorization.

20560256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160641 (or 160629 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 20560256 is about 4534.3418486038. The cubic root of 20560256 is about 273.9530706207.

Adding to 20560256 its reverse (65206502), we get a palindrome (85766758).

The spelling of 20560256 in words is "twenty million, five hundred sixty thousand, two hundred fifty-six".