20698664 has 32 divisors (see below), whose sum is σ = 44774400. Its totient is φ = 8786880.

The previous prime is 20698661. The next prime is 20698679. The reversal of 20698664 is 46689602.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4409 + ... + 7799.

It is an arithmetic number, because the mean of its divisors is an integer number (1399200).

Almost surely, 2^20698664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20698664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22387200).

20698664 is an abundant number, since it is smaller than the sum of its proper divisors (24075736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20698664 is a wasteful number, since it uses less digits than its factorization.

20698664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3513 (or 3509 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 20698664 is about 4549.5784420098. The cubic root of 20698664 is about 274.5664308371.

The spelling of 20698664 in words is "twenty million, six hundred ninety-eight thousand, six hundred sixty-four".