20623610369 has 2 divisors, whose sum is σ = 20623610370. Its totient is φ = 20623610368.

The previous prime is 20623610323. The next prime is 20623610383. The reversal of 20623610369 is 96301632602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15791692225 + 4831918144 = 125665^2 + 69512^2 .

It is a cyclic number.

It is not a de Polignac number, because 20623610369 - 2²⁰ = 20622561793 is a prime.

It is a super-2 number, since 2×20623610369² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20623610309) 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, 10311805184 + 10311805185.

It is an arithmetic number, because the mean of its divisors is an integer number (10311805185).

Almost surely, 2^20623610369 is an apocalyptic number.

It is an amenable number.

20623610369 is a deficient number, since it is larger than the sum of its proper divisors (1).

20623610369 is an equidigital number, since it uses as much as digits as its factorization.

20623610369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 38.

The spelling of 20623610369 in words is "twenty billion, six hundred twenty-three million, six hundred ten thousand, three hundred sixty-nine".