20400323569 has 2 divisors, whose sum is σ = 20400323570. Its totient is φ = 20400323568.

The previous prime is 20400323549. The next prime is 20400323599. The reversal of 20400323569 is 96532300402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11148192225 + 9252131344 = 105585^2 + 96188^2 .

It is a cyclic number.

It is not a de Polignac number, because 20400323569 - 2²⁹ = 19863452657 is a prime.

It is a super-2 number, since 2×20400323569² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20400323549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200161784 + 10200161785.

It is an arithmetic number, because the mean of its divisors is an integer number (10200161785).

Almost surely, 2^20400323569 is an apocalyptic number.

It is an amenable number.

20400323569 is a deficient number, since it is larger than the sum of its proper divisors (1).

20400323569 is an equidigital number, since it uses as much as digits as its factorization.

20400323569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 34.

The spelling of 20400323569 in words is "twenty billion, four hundred million, three hundred twenty-three thousand, five hundred sixty-nine".