20861342777 has 16 divisors (see below), whose sum is σ = 22926499200. Its totient is φ = 18824749440.

The previous prime is 20861342737. The next prime is 20861342783. The reversal of 20861342777 is 77724316802.

It is a cyclic number.

It is not a de Polignac number, because 20861342777 - 2⁶ = 20861342713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20861342737) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 940349 + ... + 962277.

It is an arithmetic number, because the mean of its divisors is an integer number (1432906200).

Almost surely, 2^20861342777 is an apocalyptic number.

It is an amenable number.

20861342777 is a deficient number, since it is larger than the sum of its proper divisors (2065156423).

20861342777 is a wasteful number, since it uses less digits than its factorization.

20861342777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22576.

The product of its (nonzero) digits is 790272, while the sum is 47.

The spelling of 20861342777 in words is "twenty billion, eight hundred sixty-one million, three hundred forty-two thousand, seven hundred seventy-seven".