20698369 has 2 divisors, whose sum is σ = 20698370. Its totient is φ = 20698368.

The previous prime is 20698343. The next prime is 20698387. The reversal of 20698369 is 96389602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15499969 + 5198400 = 3937^2 + 2280^2 .

It is a cyclic number.

It is not a de Polignac number, because 20698369 - 2⁷ = 20698241 is a prime.

It is a super-2 number, since 2×20698369² = 856844958520322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20698319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10349184 + 10349185.

It is an arithmetic number, because the mean of its divisors is an integer number (10349185).

Almost surely, 2^20698369 is an apocalyptic number.

It is an amenable number.

20698369 is a deficient number, since it is larger than the sum of its proper divisors (1).

20698369 is an equidigital number, since it uses as much as digits as its factorization.

20698369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 20698369 is about 4549.5460213081. The cubic root of 20698369 is about 274.5651264457.

The spelling of 20698369 in words is "twenty million, six hundred ninety-eight thousand, three hundred sixty-nine".