20698169 has 2 divisors, whose sum is σ = 20698170. Its totient is φ = 20698168.

The previous prime is 20698157. The next prime is 20698211. The reversal of 20698169 is 96189602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13875625 + 6822544 = 3725^2 + 2612^2 .

It is a cyclic number.

It is not a de Polignac number, because 20698169 - 2²⁰ = 19649593 is a prime.

It is a super-2 number, since 2×20698169² = 856828399905122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20698369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10349084 + 10349085.

It is an arithmetic number, because the mean of its divisors is an integer number (10349085).

Almost surely, 2^20698169 is an apocalyptic number.

It is an amenable number.

20698169 is a deficient number, since it is larger than the sum of its proper divisors (1).

20698169 is an equidigital number, since it uses as much as digits as its factorization.

20698169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 20698169 is about 4549.5240410399. The cubic root of 20698169 is about 274.5642421054.

The spelling of 20698169 in words is "twenty million, six hundred ninety-eight thousand, one hundred sixty-nine".