20345884289 has 2 divisors, whose sum is σ = 20345884290. Its totient is φ = 20345884288.

The previous prime is 20345884261. The next prime is 20345884309. The reversal of 20345884289 is 98248854302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13992997264 + 6352887025 = 118292^2 + 79705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20345884289 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20345884289.

It is not a weakly prime, because it can be changed into another prime (20345884259) 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, 10172942144 + 10172942145.

It is an arithmetic number, because the mean of its divisors is an integer number (10172942145).

Almost surely, 2^20345884289 is an apocalyptic number.

It is an amenable number.

20345884289 is a deficient number, since it is larger than the sum of its proper divisors (1).

20345884289 is an equidigital number, since it uses as much as digits as its factorization.

20345884289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4423680, while the sum is 53.

The spelling of 20345884289 in words is "twenty billion, three hundred forty-five million, eight hundred eighty-four thousand, two hundred eighty-nine".