20057565361 has 4 divisors (see below), whose sum is σ = 20078972452. Its totient is φ = 20036158272.

The previous prime is 20057565329. The next prime is 20057565377. The reversal of 20057565361 is 16356575002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9755315361 + 10302250000 = 98769^2 + 101500^2 .

It is a cyclic number.

It is not a de Polignac number, because 20057565361 - 2⁵ = 20057565329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20057565461) 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, 10702140 + ... + 10704013.

It is an arithmetic number, because the mean of its divisors is an integer number (5019743113).

Almost surely, 2^20057565361 is an apocalyptic number.

It is an amenable number.

20057565361 is a deficient number, since it is larger than the sum of its proper divisors (21407091).

20057565361 is an equidigital number, since it uses as much as digits as its factorization.

20057565361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21407090.

The product of its (nonzero) digits is 189000, while the sum is 40.

The spelling of 20057565361 in words is "twenty billion, fifty-seven million, five hundred sixty-five thousand, three hundred sixty-one".