20576129309 has 2 divisors, whose sum is σ = 20576129310. Its totient is φ = 20576129308.

The previous prime is 20576129293. The next prime is 20576129323. The reversal of 20576129309 is 90392167502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17464944025 + 3111185284 = 132155^2 + 55778^2 .

It is a cyclic number.

It is not a de Polignac number, because 20576129309 - 2⁴ = 20576129293 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20576129309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20576129339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10288064654 + 10288064655.

It is an arithmetic number, because the mean of its divisors is an integer number (10288064655).

Almost surely, 2^20576129309 is an apocalyptic number.

It is an amenable number.

20576129309 is a deficient number, since it is larger than the sum of its proper divisors (1).

20576129309 is an equidigital number, since it uses as much as digits as its factorization.

20576129309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 44.

The spelling of 20576129309 in words is "twenty billion, five hundred seventy-six million, one hundred twenty-nine thousand, three hundred nine".