20320306057 has 32 divisors (see below), whose sum is σ = 22403325600. Its totient is φ = 18352189440.

The previous prime is 20320306043. The next prime is 20320306073. The reversal of 20320306057 is 75060302302.

It can be written as a sum of positive squares in 16 ways, for example, as 2587655161 + 17732650896 = 50869^2 + 133164^2 .

It is not a de Polignac number, because 20320306057 - 2¹¹ = 20320304009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20320306037) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14713507 + ... + 14714887.

It is an arithmetic number, because the mean of its divisors is an integer number (700103925).

Almost surely, 2^20320306057 is an apocalyptic number.

It is an amenable number.

20320306057 is a deficient number, since it is larger than the sum of its proper divisors (2083019543).

20320306057 is a wasteful number, since it uses less digits than its factorization.

20320306057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1741.

The product of its (nonzero) digits is 7560, while the sum is 28.

Adding to 20320306057 its reverse (75060302302), we get a palindrome (95380608359).

The spelling of 20320306057 in words is "twenty billion, three hundred twenty million, three hundred six thousand, fifty-seven".