20698969 has 4 divisors (see below), whose sum is σ = 20724480. Its totient is φ = 20673460.

The previous prime is 20698949. The next prime is 20698981. The reversal of 20698969 is 96989602.

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 20698969 - 2¹⁵ = 20666201 is a prime.

It is a super-2 number, since 2×20698969² = 856894635325922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20698939) 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, 11497 + ... + 13174.

It is an arithmetic number, because the mean of its divisors is an integer number (5181120).

Almost surely, 2^20698969 is an apocalyptic number.

It is an amenable number.

20698969 is a deficient number, since it is larger than the sum of its proper divisors (25511).

20698969 is an equidigital number, since it uses as much as digits as its factorization.

20698969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25510.

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 20698969 is about 4549.6119614754. The cubic root of 20698969 is about 274.5677794322.

The spelling of 20698969 in words is "twenty million, six hundred ninety-eight thousand, nine hundred sixty-nine".