20565256502 has 48 divisors (see below), whose sum is σ = 36471636960. Its totient is φ = 8518763520.

The previous prime is 20565256487. The next prime is 20565256531.

20565256502 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2561198 + ... + 2569214.

It is an arithmetic number, because the mean of its divisors is an integer number (759825770).

Almost surely, 2^20565256502 is an apocalyptic number.

20565256502 is a deficient number, since it is larger than the sum of its proper divisors (15906380458).

20565256502 is a wasteful number, since it uses less digits than its factorization.

20565256502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8217 (or 8176 counting only the distinct ones).

The product of its (nonzero) digits is 180000, while the sum is 38.

The spelling of 20565256502 in words is "twenty billion, five hundred sixty-five million, two hundred fifty-six thousand, five hundred two".