20698579357 has 2 divisors, whose sum is σ = 20698579358. Its totient is φ = 20698579356.

The previous prime is 20698579339. The next prime is 20698579387. The reversal of 20698579357 is 75397589602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12044184516 + 8654394841 = 109746^2 + 93029^2 .

It is a cyclic number.

It is not a de Polignac number, because 20698579357 - 2⁷ = 20698579229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20698579295 and 20698579304.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20698579327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10349289678 + 10349289679.

It is an arithmetic number, because the mean of its divisors is an integer number (10349289679).

Almost surely, 2^20698579357 is an apocalyptic number.

It is an amenable number.

20698579357 is a deficient number, since it is larger than the sum of its proper divisors (1).

20698579357 is an equidigital number, since it uses as much as digits as its factorization.

20698579357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28576800, while the sum is 61.

The spelling of 20698579357 in words is "twenty billion, six hundred ninety-eight million, five hundred seventy-nine thousand, three hundred fifty-seven".