20698849 has 2 divisors, whose sum is σ = 20698850. Its totient is φ = 20698848.

The previous prime is 20698817. The next prime is 20698859. The reversal of 20698849 is 94889602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17164449 + 3534400 = 4143^2 + 1880^2 .

It is a cyclic number.

It is not a de Polignac number, because 20698849 - 2⁵ = 20698817 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20698799 and 20698808.

It is not a weakly prime, because it can be changed into another prime (20698859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10349424 + 10349425.

It is an arithmetic number, because the mean of its divisors is an integer number (10349425).

Almost surely, 2^20698849 is an apocalyptic number.

It is an amenable number.

20698849 is a deficient number, since it is larger than the sum of its proper divisors (1).

20698849 is an equidigital number, since it uses as much as digits as its factorization.

20698849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 20698849 is about 4549.5987735184. The cubic root of 20698849 is about 274.5672488390.

The spelling of 20698849 in words is "twenty million, six hundred ninety-eight thousand, eight hundred forty-nine".