20839369 has 4 divisors (see below), whose sum is σ = 21181060. Its totient is φ = 20497680.

The previous prime is 20839367. The next prime is 20839373. The reversal of 20839369 is 96393802.

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 697225 + 20142144 = 835^2 + 4488^2 .

It is a cyclic number.

It is not a de Polignac number, because 20839369 - 2¹ = 20839367 is a prime.

It is a super-2 number, since 2×20839369² = 868558600636322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20839367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170754 + ... + 170875.

It is an arithmetic number, because the mean of its divisors is an integer number (5295265).

Almost surely, 2^20839369 is an apocalyptic number.

It is an amenable number.

20839369 is a deficient number, since it is larger than the sum of its proper divisors (341691).

20839369 is an equidigital number, since it uses as much as digits as its factorization.

20839369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341690.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 20839369 is about 4565.0157721524. The cubic root of 20839369 is about 275.1871739518.

The spelling of 20839369 in words is "twenty million, eight hundred thirty-nine thousand, three hundred sixty-nine".