20698761 has 4 divisors (see below), whose sum is σ = 27598352. Its totient is φ = 13799172.

The previous prime is 20698759. The next prime is 20698763. The reversal of 20698761 is 16789602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (20698759) and next prime (20698763).

It is not a de Polignac number, because 20698761 - 2¹ = 20698759 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20698763) 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, 3449791 + ... + 3449796.

It is an arithmetic number, because the mean of its divisors is an integer number (6899588).

Almost surely, 2^20698761 is an apocalyptic number.

It is an amenable number.

20698761 is a deficient number, since it is larger than the sum of its proper divisors (6899591).

20698761 is an equidigital number, since it uses as much as digits as its factorization.

20698761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6899590.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 20698761 is about 4549.5891023256. The cubic root of 20698761 is about 274.5668597360.

The spelling of 20698761 in words is "twenty million, six hundred ninety-eight thousand, seven hundred sixty-one".