20698840 has 16 divisors (see below), whose sum is σ = 46572480. Its totient is φ = 8279520.

The previous prime is 20698817. The next prime is 20698849. The reversal of 20698840 is 4889602.

It is a self number, because there is not a number n which added to its sum of digits gives 20698840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20698849) 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, 258696 + ... + 258775.

It is an arithmetic number, because the mean of its divisors is an integer number (2910780).

Almost surely, 2^20698840 is an apocalyptic number.

20698840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20698840 is an abundant number, since it is smaller than the sum of its proper divisors (25873640).

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

20698840 is a wasteful number, since it uses less digits than its factorization.

20698840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517482 (or 517478 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 20698840 is about 4549.5977844201. The cubic root of 20698840 is about 274.5672090444.

The spelling of 20698840 in words is "twenty million, six hundred ninety-eight thousand, eight hundred forty".