20698019 has 2 divisors, whose sum is σ = 20698020. Its totient is φ = 20698018.

The previous prime is 20698003. The next prime is 20698039. The reversal of 20698019 is 91089602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20698019 - 2⁴ = 20698003 is a prime.

It is a super-2 number, since 2×20698019² = 856815981048722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20698019.

It is not a weakly prime, because it can be changed into another prime (20698039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10349009 + 10349010.

It is an arithmetic number, because the mean of its divisors is an integer number (10349010).

Almost surely, 2^20698019 is an apocalyptic number.

20698019 is a deficient number, since it is larger than the sum of its proper divisors (1).

20698019 is an equidigital number, since it uses as much as digits as its factorization.

20698019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 20698019 is about 4549.5075557691. The cubic root of 20698019 is about 274.5635788465.

The spelling of 20698019 in words is "twenty million, six hundred ninety-eight thousand, nineteen".