20320252613 has 2 divisors, whose sum is σ = 20320252614. Its totient is φ = 20320252612.

The previous prime is 20320252591. The next prime is 20320252627. The reversal of 20320252613 is 31625202302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15866425444 + 4453827169 = 125962^2 + 66737^2 .

It is a cyclic number.

It is not a de Polignac number, because 20320252613 - 2⁸ = 20320252357 is a prime.

It is a super-2 number, since 2×20320252613² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20320212613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160126306 + 10160126307.

It is an arithmetic number, because the mean of its divisors is an integer number (10160126307).

Almost surely, 2^20320252613 is an apocalyptic number.

It is an amenable number.

20320252613 is a deficient number, since it is larger than the sum of its proper divisors (1).

20320252613 is an equidigital number, since it uses as much as digits as its factorization.

20320252613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 20320252613 its reverse (31625202302), we get a palindrome (51945454915).

The spelling of 20320252613 in words is "twenty billion, three hundred twenty million, two hundred fifty-two thousand, six hundred thirteen".