20859166775 has 12 divisors (see below), whose sum is σ = 25905364272. Its totient is φ = 16661528640.

The previous prime is 20859166771. The next prime is 20859166789. The reversal of 20859166775 is 57766195802.

It is not a de Polignac number, because 20859166775 - 2² = 20859166771 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20859166775.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20859166771) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 628622 + ... + 660971.

It is an arithmetic number, because the mean of its divisors is an integer number (2158780356).

Almost surely, 2^20859166775 is an apocalyptic number.

20859166775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20859166775 is a deficient number, since it is larger than the sum of its proper divisors (5046197497).

20859166775 is a wasteful number, since it uses less digits than its factorization.

20859166775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290250 (or 1290245 counting only the distinct ones).

The product of its (nonzero) digits is 6350400, while the sum is 56.

The spelling of 20859166775 in words is "twenty billion, eight hundred fifty-nine million, one hundred sixty-six thousand, seven hundred seventy-five".