20313231233 has 2 divisors, whose sum is σ = 20313231234. Its totient is φ = 20313231232.

The previous prime is 20313231209. The next prime is 20313231247. The reversal of 20313231233 is 33213231302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14321387584 + 5991843649 = 119672^2 + 77407^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20313231233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20313231199 and 20313231208.

It is not a weakly prime, because it can be changed into another prime (20313231203) 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, 10156615616 + 10156615617.

It is an arithmetic number, because the mean of its divisors is an integer number (10156615617).

Almost surely, 2^20313231233 is an apocalyptic number.

It is an amenable number.

20313231233 is a deficient number, since it is larger than the sum of its proper divisors (1).

20313231233 is an equidigital number, since it uses as much as digits as its factorization.

20313231233 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 20313231233 its reverse (33213231302), we get a palindrome (53526462535).

The spelling of 20313231233 in words is "twenty billion, three hundred thirteen million, two hundred thirty-one thousand, two hundred thirty-three".