20131323073 has 2 divisors, whose sum is σ = 20131323074. Its totient is φ = 20131323072.

The previous prime is 20131323059. The next prime is 20131323083. The reversal of 20131323073 is 37032313102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18600322689 + 1531000384 = 136383^2 + 39128^2 .

It is a cyclic number.

It is not a de Polignac number, because 20131323073 - 2²⁵ = 20097768641 is a prime.

It is not a weakly prime, because it can be changed into another prime (20131323083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10065661536 + 10065661537.

It is an arithmetic number, because the mean of its divisors is an integer number (10065661537).

Almost surely, 2^20131323073 is an apocalyptic number.

It is an amenable number.

20131323073 is a deficient number, since it is larger than the sum of its proper divisors (1).

20131323073 is an equidigital number, since it uses as much as digits as its factorization.

20131323073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 25.

Adding to 20131323073 its reverse (37032313102), we get a palindrome (57163636175).

The spelling of 20131323073 in words is "twenty billion, one hundred thirty-one million, three hundred twenty-three thousand, seventy-three".