20698345 has 8 divisors (see below), whose sum is σ = 25094664. Its totient is φ = 16387584.

The previous prime is 20698343. The next prime is 20698369. The reversal of 20698345 is 54389602.

It can be written as a sum of positive squares in 4 ways, for example, as 2277081 + 18421264 = 1509^2 + 4292^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20698345 - 2¹ = 20698343 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20698343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20854 + ... + 21823.

It is an arithmetic number, because the mean of its divisors is an integer number (3136833).

Almost surely, 2^20698345 is an apocalyptic number.

It is an amenable number.

20698345 is a deficient number, since it is larger than the sum of its proper divisors (4396319).

20698345 is an equidigital number, since it uses as much as digits as its factorization.

20698345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42779.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 20698345 is about 4549.5433836815. The cubic root of 20698345 is about 274.5650203251.

The spelling of 20698345 in words is "twenty million, six hundred ninety-eight thousand, three hundred forty-five".