20949632798569 has 2 divisors, whose sum is σ = 20949632798570. Its totient is φ = 20949632798568.

The previous prime is 20949632798537. The next prime is 20949632798573. The reversal of 20949632798569 is 96589723694902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15998496035344 + 4951136763225 = 3999812^2 + 2225115^2 .

It is a cyclic number.

It is not a de Polignac number, because 20949632798569 - 2⁵ = 20949632798537 is a prime.

It is a super-2 number, since 2×20949632798569² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20949632798869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10474816399284 + 10474816399285.

It is an arithmetic number, because the mean of its divisors is an integer number (10474816399285).

Almost surely, 2^{20949632798569} is an apocalyptic number.

It is an amenable number.

20949632798569 is a deficient number, since it is larger than the sum of its proper divisors (1).

20949632798569 is an equidigital number, since it uses as much as digits as its factorization.

20949632798569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3174474240, while the sum is 79.

The spelling of 20949632798569 in words is "twenty trillion, nine hundred forty-nine billion, six hundred thirty-two million, seven hundred ninety-eight thousand, five hundred sixty-nine".