20320264537 has 2 divisors, whose sum is σ = 20320264538. Its totient is φ = 20320264536.

The previous prime is 20320264529. The next prime is 20320264603. The reversal of 20320264537 is 73546202302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15310597696 + 5009666841 = 123736^2 + 70779^2 .

It is a cyclic number.

It is not a de Polignac number, because 20320264537 - 2³ = 20320264529 is a prime.

It is not a weakly prime, because it can be changed into another prime (20320264507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160132268 + 10160132269.

It is an arithmetic number, because the mean of its divisors is an integer number (10160132269).

Almost surely, 2^20320264537 is an apocalyptic number.

It is an amenable number.

20320264537 is a deficient number, since it is larger than the sum of its proper divisors (1).

20320264537 is an equidigital number, since it uses as much as digits as its factorization.

20320264537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 34.

Adding to 20320264537 its reverse (73546202302), we get a palindrome (93866466839).

The spelling of 20320264537 in words is "twenty billion, three hundred twenty million, two hundred sixty-four thousand, five hundred thirty-seven".