20331343517 has 2 divisors, whose sum is σ = 20331343518. Its totient is φ = 20331343516.

The previous prime is 20331343457. The next prime is 20331343523. The reversal of 20331343517 is 71534313302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20215436761 + 115906756 = 142181^2 + 10766^2 .

It is a cyclic number.

It is not a de Polignac number, because 20331343517 - 2³² = 16036376221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20331343597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165671758 + 10165671759.

It is an arithmetic number, because the mean of its divisors is an integer number (10165671759).

Almost surely, 2^20331343517 is an apocalyptic number.

It is an amenable number.

20331343517 is a deficient number, since it is larger than the sum of its proper divisors (1).

20331343517 is an equidigital number, since it uses as much as digits as its factorization.

20331343517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 32.

Adding to 20331343517 its reverse (71534313302), we get a palindrome (91865656819).

The spelling of 20331343517 in words is "twenty billion, three hundred thirty-one million, three hundred forty-three thousand, five hundred seventeen".