20818090161 has 12 divisors (see below), whose sum is σ = 32804263440. Its totient is φ = 12617024280.

The previous prime is 20818090159. The next prime is 20818090217. The reversal of 20818090161 is 16109081802.

It is not a de Polignac number, because 20818090161 - 2¹ = 20818090159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20818092161) 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, 105141771 + ... + 105141968.

It is an arithmetic number, because the mean of its divisors is an integer number (2733688620).

Almost surely, 2^20818090161 is an apocalyptic number.

It is an amenable number.

20818090161 is a deficient number, since it is larger than the sum of its proper divisors (11986173279).

20818090161 is a wasteful number, since it uses less digits than its factorization.

20818090161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210283756 (or 210283753 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 36.

The spelling of 20818090161 in words is "twenty billion, eight hundred eighteen million, ninety thousand, one hundred sixty-one".