20736576161 has 16 divisors (see below), whose sum is σ = 24038913024. Its totient is φ = 17520204624.

The previous prime is 20736576127. The next prime is 20736576197. The reversal of 20736576161 is 16167563702.

It is a cyclic number.

It is not a de Polignac number, because 20736576161 - 2³⁴ = 3556706977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20736576061) 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 15 ways as a sum of consecutive naturals, for example, 217100 + ... + 297666.

It is an arithmetic number, because the mean of its divisors is an integer number (1502432064).

Almost surely, 2^20736576161 is an apocalyptic number.

It is an amenable number.

20736576161 is a deficient number, since it is larger than the sum of its proper divisors (3302336863).

20736576161 is an equidigital number, since it uses as much as digits as its factorization.

20736576161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81100.

The product of its (nonzero) digits is 317520, while the sum is 44.

The spelling of 20736576161 in words is "twenty billion, seven hundred thirty-six million, five hundred seventy-six thousand, one hundred sixty-one".