20876640256 has 30 divisors (see below), whose sum is σ = 41752039070. Its totient is φ = 10438311936.

The previous prime is 20876640193. The next prime is 20876640293. The reversal of 20876640256 is 65204667802.

It can be written as a sum of positive squares in only one way, i.e., 19932921856 + 943718400 = 141184^2 + 30720^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620721 + ... + 653488.

Almost surely, 2^20876640256 is an apocalyptic number.

It is an amenable number.

20876640256 is a deficient number, since it is larger than the sum of its proper divisors (20875398814).

20876640256 is an frugal number, since it uses more digits than its factorization.

20876640256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1274237 (or 1274211 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 46.

The spelling of 20876640256 in words is "twenty billion, eight hundred seventy-six million, six hundred forty thousand, two hundred fifty-six".