20776670470561 has 4 divisors (see below), whose sum is σ = 20978385717952. Its totient is φ = 20574955223172.

The previous prime is 20776670470529. The next prime is 20776670470573. The reversal of 20776670470561 is 16507407667702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20776670470561 - 2⁵ = 20776670470529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20776670470496 and 20776670470505.

It is not an unprimeable number, because it can be changed into a prime (20776670470861) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 100857623541 + ... + 100857623746.

It is an arithmetic number, because the mean of its divisors is an integer number (5244596429488).

Almost surely, 2^{20776670470561} is an apocalyptic number.

It is an amenable number.

20776670470561 is a deficient number, since it is larger than the sum of its proper divisors (201715247391).

20776670470561 is a wasteful number, since it uses less digits than its factorization.

20776670470561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201715247390.

The product of its (nonzero) digits is 20744640, while the sum is 58.

The spelling of 20776670470561 in words is "twenty trillion, seven hundred seventy-six billion, six hundred seventy million, four hundred seventy thousand, five hundred sixty-one".