20123005361 has 2 divisors, whose sum is σ = 20123005362. Its totient is φ = 20123005360.

The previous prime is 20123005351. The next prime is 20123005403. The reversal of 20123005361 is 16350032102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18535461025 + 1587544336 = 136145^2 + 39844^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20123005361 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20123005351) 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, 10061502680 + 10061502681.

It is an arithmetic number, because the mean of its divisors is an integer number (10061502681).

Almost surely, 2^20123005361 is an apocalyptic number.

It is an amenable number.

20123005361 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123005361 is an equidigital number, since it uses as much as digits as its factorization.

20123005361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 23.

Adding to 20123005361 its reverse (16350032102), we get a palindrome (36473037463).

The spelling of 20123005361 in words is "twenty billion, one hundred twenty-three million, five thousand, three hundred sixty-one".