20818095330161 has 16 divisors (see below), whose sum is σ = 21067114253328. Its totient is φ = 20570779219200.

The previous prime is 20818095330089. The next prime is 20818095330163. The reversal of 20818095330161 is 16103359081802.

It can be written as a sum of positive squares in 8 ways, for example, as 1340834307136 + 19477261023025 = 1157944^2 + 4413305^2 .

It is a cyclic number.

It is not a de Polignac number, because 20818095330161 - 2¹⁰ = 20818095329137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20818095330163) 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, 31745651 + ... + 32394791.

It is an arithmetic number, because the mean of its divisors is an integer number (1316694640833).

Almost surely, 2^{20818095330161} is an apocalyptic number.

It is an amenable number.

20818095330161 is a deficient number, since it is larger than the sum of its proper divisors (249018923167).

20818095330161 is a wasteful number, since it uses less digits than its factorization.

20818095330161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650452.

The product of its (nonzero) digits is 311040, while the sum is 47.

The spelling of 20818095330161 in words is "twenty trillion, eight hundred eighteen billion, ninety-five million, three hundred thirty thousand, one hundred sixty-one".