20698901 has 4 divisors (see below), whose sum is σ = 20744652. Its totient is φ = 20653152.

The previous prime is 20698883. The next prime is 20698933. The reversal of 20698901 is 10989602.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15792676 + 4906225 = 3974^2 + 2215^2 .

It is a cyclic number.

It is not a de Polignac number, because 20698901 - 2¹⁰ = 20697877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20698981) 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, 22190 + ... + 23103.

It is an arithmetic number, because the mean of its divisors is an integer number (5186163).

Almost surely, 2^20698901 is an apocalyptic number.

It is an amenable number.

20698901 is a deficient number, since it is larger than the sum of its proper divisors (45751).

20698901 is an equidigital number, since it uses as much as digits as its factorization.

20698901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45750.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 20698901 is about 4549.6044883045. The cubic root of 20698901 is about 274.5674787630.

The spelling of 20698901 in words is "twenty million, six hundred ninety-eight thousand, nine hundred one".