20698388 has 12 divisors (see below), whose sum is σ = 36405600. Its totient is φ = 10296792.

The previous prime is 20698387. The next prime is 20698397. The reversal of 20698388 is 88389602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20698387) 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 3 ways as a sum of consecutive naturals, for example, 12206 + ... + 13797.

It is an arithmetic number, because the mean of its divisors is an integer number (3033800).

Almost surely, 2^20698388 is an apocalyptic number.

It is an amenable number.

20698388 is a deficient number, since it is larger than the sum of its proper divisors (15707212).

20698388 is a wasteful number, since it uses less digits than its factorization.

20698388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26206 (or 26204 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 20698388 is about 4549.5481094280. The cubic root of 20698388 is about 274.5652104577.

The spelling of 20698388 in words is "twenty million, six hundred ninety-eight thousand, three hundred eighty-eight".