20210489 has 4 divisors (see below), whose sum is σ = 21765156. Its totient is φ = 18655824.

The previous prime is 20210479. The next prime is 20210497. The reversal of 20210489 is 98401202.

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 12482089 + 7728400 = 3533^2 + 2780^2 .

It is a cyclic number.

It is not a de Polignac number, because 20210489 - 2²⁰ = 19161913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20210479) 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, 777314 + ... + 777339.

It is an arithmetic number, because the mean of its divisors is an integer number (5441289).

Almost surely, 2^20210489 is an apocalyptic number.

It is an amenable number.

20210489 is a deficient number, since it is larger than the sum of its proper divisors (1554667).

20210489 is a wasteful number, since it uses less digits than its factorization.

20210489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1554666.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 20210489 is about 4495.6077453443. The cubic root of 20210489 is about 272.3906988069.

The spelling of 20210489 in words is "twenty million, two hundred ten thousand, four hundred eighty-nine".