20504136718369 has 8 divisors (see below), whose sum is σ = 20514306564648. Its totient is φ = 20493969377280.

The previous prime is 20504136718319. The next prime is 20504136718421. The reversal of 20504136718369 is 96381763140502.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8603292660769 + 11900844057600 = 2933137^2 + 3449760^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20504136718369 - 2¹¹ = 20504136716321 is a prime.

It is a super-2 number, since 2×20504136718369² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20504136718319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15854419 + ... + 17098855.

It is an arithmetic number, because the mean of its divisors is an integer number (2564288320581).

It is a 1-persistent number, because it is pandigital, but 2⋅20504136718369 = 41008273436738 is not.

Almost surely, 2^{20504136718369} is an apocalyptic number.

It is an amenable number.

20504136718369 is a deficient number, since it is larger than the sum of its proper divisors (10169846279).

20504136718369 is a wasteful number, since it uses less digits than its factorization.

20504136718369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1252595.

The product of its (nonzero) digits is 6531840, while the sum is 55.

The spelling of 20504136718369 in words is "twenty trillion, five hundred four billion, one hundred thirty-six million, seven hundred eighteen thousand, three hundred sixty-nine".