20698579087 has 2 divisors, whose sum is σ = 20698579088. Its totient is φ = 20698579086.

The previous prime is 20698579073. The next prime is 20698579123. The reversal of 20698579087 is 78097589602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20698579087 - 2³¹ = 18551095439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20698579387) 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, 10349289543 + 10349289544.

It is an arithmetic number, because the mean of its divisors is an integer number (10349289544).

Almost surely, 2^20698579087 is an apocalyptic number.

20698579087 is a deficient number, since it is larger than the sum of its proper divisors (1).

20698579087 is an equidigital number, since it uses as much as digits as its factorization.

20698579087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15240960, while the sum is 61.

The spelling of 20698579087 in words is "twenty billion, six hundred ninety-eight million, five hundred seventy-nine thousand, eighty-seven".