20698669 has 4 divisors (see below), whose sum is σ = 21366400. Its totient is φ = 20030940.

The previous prime is 20698661. The next prime is 20698679. The reversal of 20698669 is 96689602.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20698669 - 2³ = 20698661 is a prime.

It is a super-2 number, since 2×20698669² = 856869796743122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20698661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333819 + ... + 333880.

It is an arithmetic number, because the mean of its divisors is an integer number (5341600).

Almost surely, 2^20698669 is an apocalyptic number.

It is an amenable number.

20698669 is a deficient number, since it is larger than the sum of its proper divisors (667731).

20698669 is an equidigital number, since it uses as much as digits as its factorization.

20698669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667730.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 20698669 is about 4549.5789915112. The cubic root of 20698669 is about 274.5664529453.

The spelling of 20698669 in words is "twenty million, six hundred ninety-eight thousand, six hundred sixty-nine".