20698245545687 has 4 divisors (see below), whose sum is σ = 20744968448040. Its totient is φ = 20651522643336.

The previous prime is 20698245545629. The next prime is 20698245545701. The reversal of 20698245545687 is 78654554289602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20698245545687 - 2¹⁴ = 20698245529303 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20698245545687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20698245547687) 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, 23361450512 + ... + 23361451397.

It is an arithmetic number, because the mean of its divisors is an integer number (5186242112010).

Almost surely, 2^{20698245545687} is an apocalyptic number.

20698245545687 is a deficient number, since it is larger than the sum of its proper divisors (46722902353).

20698245545687 is an equidigital number, since it uses as much as digits as its factorization.

20698245545687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46722902352.

The product of its (nonzero) digits is 1161216000, while the sum is 71.

The spelling of 20698245545687 in words is "twenty trillion, six hundred ninety-eight billion, two hundred forty-five million, five hundred forty-five thousand, six hundred eighty-seven".