20312203291 has 2 divisors, whose sum is σ = 20312203292. Its totient is φ = 20312203290.

The previous prime is 20312203277. The next prime is 20312203393. The reversal of 20312203291 is 19230221302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20312203291 - 2⁵ = 20312203259 is a prime.

It is a super-2 number, since 2×20312203291² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20312213291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156101645 + 10156101646.

It is an arithmetic number, because the mean of its divisors is an integer number (10156101646).

Almost surely, 2^20312203291 is an apocalyptic number.

20312203291 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312203291 is an equidigital number, since it uses as much as digits as its factorization.

20312203291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 20312203291 its reverse (19230221302), we get a palindrome (39542424593).

The spelling of 20312203291 in words is "twenty billion, three hundred twelve million, two hundred three thousand, two hundred ninety-one".