20698907 has 4 divisors (see below), whose sum is σ = 20847960. Its totient is φ = 20549856.

The previous prime is 20698883. The next prime is 20698933. The reversal of 20698907 is 70989602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70989602 = 2 ⋅35494801.

It is a cyclic number.

It is not a de Polignac number, because 20698907 - 2¹⁰ = 20697883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20698507) 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, 74318 + ... + 74595.

It is an arithmetic number, because the mean of its divisors is an integer number (5211990).

Almost surely, 2^20698907 is an apocalyptic number.

20698907 is a deficient number, since it is larger than the sum of its proper divisors (149053).

20698907 is a wasteful number, since it uses less digits than its factorization.

20698907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149052.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 20698907 is about 4549.6051477024. The cubic root of 20698907 is about 274.5675052926.

The spelling of 20698907 in words is "twenty million, six hundred ninety-eight thousand, nine hundred seven".