20687365361 has 8 divisors (see below), whose sum is σ = 22292535720. Its totient is φ = 19084171392.

The previous prime is 20687365339. The next prime is 20687365411. The reversal of 20687365361 is 16356378602.

It can be written as a sum of positive squares in 4 ways, for example, as 727326961 + 19960038400 = 26969^2 + 141280^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-20687365361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20687365301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 472316 + ... + 514253.

It is an arithmetic number, because the mean of its divisors is an integer number (2786566965).

Almost surely, 2^20687365361 is an apocalyptic number.

It is an amenable number.

20687365361 is a deficient number, since it is larger than the sum of its proper divisors (1605170359).

20687365361 is a wasteful number, since it uses less digits than its factorization.

20687365361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988195.

The product of its (nonzero) digits is 1088640, while the sum is 47.

The spelling of 20687365361 in words is "twenty billion, six hundred eighty-seven million, three hundred sixty-five thousand, three hundred sixty-one".