20659175816 has 8 divisors (see below), whose sum is σ = 38735954670. Its totient is φ = 10329587904.

The previous prime is 20659175813. The next prime is 20659175821. The reversal of 20659175816 is 61857195602.

It can be written as a sum of positive squares in only one way, i.e., 15452976100 + 5206199716 = 124310^2 + 72154^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (20659175813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1291198481 + ... + 1291198496.

Almost surely, 2^20659175816 is an apocalyptic number.

It is an amenable number.

20659175816 is a deficient number, since it is larger than the sum of its proper divisors (18076778854).

20659175816 is a wasteful number, since it uses less digits than its factorization.

20659175816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2582396983 (or 2582396979 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 50.

The spelling of 20659175816 in words is "twenty billion, six hundred fifty-nine million, one hundred seventy-five thousand, eight hundred sixteen".