20494632569 has 2 divisors, whose sum is σ = 20494632570. Its totient is φ = 20494632568.

The previous prime is 20494632551. The next prime is 20494632623. The reversal of 20494632569 is 96523649402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15224598544 + 5270034025 = 123388^2 + 72595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20494632569 is a prime.

It is a super-2 number, since 2×20494632569² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20494632869) 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, 10247316284 + 10247316285.

It is an arithmetic number, because the mean of its divisors is an integer number (10247316285).

Almost surely, 2^20494632569 is an apocalyptic number.

It is an amenable number.

20494632569 is a deficient number, since it is larger than the sum of its proper divisors (1).

20494632569 is an equidigital number, since it uses as much as digits as its factorization.

20494632569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2799360, while the sum is 50.

The spelling of 20494632569 in words is "twenty billion, four hundred ninety-four million, six hundred thirty-two thousand, five hundred sixty-nine".