20330747161 has 4 divisors (see below), whose sum is σ = 20880226852. Its totient is φ = 19781267472.

The previous prime is 20330747119. The next prime is 20330747197. The reversal of 20330747161 is 16174703302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16174703302 = 2 ⋅8087351651.

It can be written as a sum of positive squares in 2 ways, for example, as 19493744400 + 837002761 = 139620^2 + 28931^2 .

It is a cyclic number.

It is not a de Polignac number, because 20330747161 - 2²¹ = 20328650009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20330747111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274739790 + ... + 274739863.

It is an arithmetic number, because the mean of its divisors is an integer number (5220056713).

Almost surely, 2^20330747161 is an apocalyptic number.

It is an amenable number.

20330747161 is a deficient number, since it is larger than the sum of its proper divisors (549479691).

20330747161 is an equidigital number, since it uses as much as digits as its factorization.

20330747161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549479690.

The product of its (nonzero) digits is 21168, while the sum is 34.

The spelling of 20330747161 in words is "twenty billion, three hundred thirty million, seven hundred forty-seven thousand, one hundred sixty-one".