20289052961 has 4 divisors (see below), whose sum is σ = 20289365424. Its totient is φ = 20288740500.

The previous prime is 20289052937. The next prime is 20289053017. The reversal of 20289052961 is 16925098202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20289052961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20289055961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18155 + ... + 202256.

It is an arithmetic number, because the mean of its divisors is an integer number (5072341356).

Almost surely, 2^20289052961 is an apocalyptic number.

It is an amenable number.

20289052961 is a deficient number, since it is larger than the sum of its proper divisors (312463).

20289052961 is an equidigital number, since it uses as much as digits as its factorization.

20289052961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312462.

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 20289052961 in words is "twenty billion, two hundred eighty-nine million, fifty-two thousand, nine hundred sixty-one".