20338677161 has 12 divisors (see below), whose sum is σ = 22505794500. Its totient is φ = 18365598240.

The previous prime is 20338677133. The next prime is 20338677173. The reversal of 20338677161 is 16177683302.

It can be written as a sum of positive squares in 2 ways, for example, as 3789141136 + 16549536025 = 61556^2 + 128645^2 .

It is not a de Polignac number, because 20338677161 - 2¹⁸ = 20338415017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20338677181) 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, 546026 + ... + 582083.

It is an arithmetic number, because the mean of its divisors is an integer number (1875482875).

Almost surely, 2^20338677161 is an apocalyptic number.

It is an amenable number.

20338677161 is a deficient number, since it is larger than the sum of its proper divisors (2167117339).

20338677161 is a wasteful number, since it uses less digits than its factorization.

20338677161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128280 (or 1128269 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 44.

The spelling of 20338677161 in words is "twenty billion, three hundred thirty-eight million, six hundred seventy-seven thousand, one hundred sixty-one".