20518730269 has 2 divisors, whose sum is σ = 20518730270. Its totient is φ = 20518730268.

The previous prime is 20518730257. The next prime is 20518730273. The reversal of 20518730269 is 96203781502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15822369369 + 4696360900 = 125787^2 + 68530^2 .

It is a cyclic number.

It is not a de Polignac number, because 20518730269 - 2⁹ = 20518729757 is a prime.

It is a super-3 number, since 3×20518730269³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20518730069) 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, 10259365134 + 10259365135.

It is an arithmetic number, because the mean of its divisors is an integer number (10259365135).

Almost surely, 2^20518730269 is an apocalyptic number.

It is an amenable number.

20518730269 is a deficient number, since it is larger than the sum of its proper divisors (1).

20518730269 is an equidigital number, since it uses as much as digits as its factorization.

20518730269 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 20518730269 in words is "twenty billion, five hundred eighteen million, seven hundred thirty thousand, two hundred sixty-nine".