20439369 has 6 divisors (see below), whose sum is σ = 29523546. Its totient is φ = 13626240.

The previous prime is 20439347. The next prime is 20439379. The reversal of 20439369 is 96393402.

It is a happy number.

20439369 is a `hidden beast` number, since 204 + 393 + 69 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20358144 + 81225 = 4512^2 + 285^2 .

It is not a de Polignac number, because 20439369 - 2²¹ = 18342217 is a prime.

It is a super-2 number, since 2×20439369² = 835535610236322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20439329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1135512 + ... + 1135529.

It is an arithmetic number, because the mean of its divisors is an integer number (4920591).

Almost surely, 2^20439369 is an apocalyptic number.

It is an amenable number.

20439369 is a deficient number, since it is larger than the sum of its proper divisors (9084177).

20439369 is a wasteful number, since it uses less digits than its factorization.

20439369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2271047 (or 2271044 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 36.

The square root of 20439369 is about 4520.9920371529. The cubic root of 20439369 is about 273.4150993067.

The spelling of 20439369 in words is "twenty million, four hundred thirty-nine thousand, three hundred sixty-nine".