20564371259 has 2 divisors, whose sum is σ = 20564371260. Its totient is φ = 20564371258.

The previous prime is 20564371199. The next prime is 20564371339. The reversal of 20564371259 is 95217346502.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20564371259 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20564371559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10282185629 + 10282185630.

It is an arithmetic number, because the mean of its divisors is an integer number (10282185630).

Almost surely, 2^20564371259 is an apocalyptic number.

20564371259 is a deficient number, since it is larger than the sum of its proper divisors (1).

20564371259 is an equidigital number, since it uses as much as digits as its factorization.

20564371259 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 453600, while the sum is 44.

The spelling of 20564371259 in words is "twenty billion, five hundred sixty-four million, three hundred seventy-one thousand, two hundred fifty-nine".