20123232257 has 2 divisors, whose sum is σ = 20123232258. Its totient is φ = 20123232256.

The previous prime is 20123232229. The next prime is 20123232271. The reversal of 20123232257 is 75223232102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20084841841 + 38390416 = 141721^2 + 6196^2 .

It is a cyclic number.

It is not a de Polignac number, because 20123232257 - 2⁸ = 20123232001 is a prime.

It is not a weakly prime, because it can be changed into another prime (20123232457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061616128 + 10061616129.

It is an arithmetic number, because the mean of its divisors is an integer number (10061616129).

Almost surely, 2^20123232257 is an apocalyptic number.

It is an amenable number.

20123232257 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123232257 is an equidigital number, since it uses as much as digits as its factorization.

20123232257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 29.

Adding to 20123232257 its reverse (75223232102), we get a palindrome (95346464359).

The spelling of 20123232257 in words is "twenty billion, one hundred twenty-three million, two hundred thirty-two thousand, two hundred fifty-seven".