20269439 has 4 divisors (see below), whose sum is σ = 20374656. Its totient is φ = 20164224.

The previous prime is 20269429. The next prime is 20269441. The reversal of 20269439 is 93496202.

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

It is a cyclic number.

It is not a de Polignac number, because 20269439 - 2¹⁶ = 20203903 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20269399 and 20269408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20269429) 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, 52319 + ... + 52704.

It is an arithmetic number, because the mean of its divisors is an integer number (5093664).

Almost surely, 2^20269439 is an apocalyptic number.

20269439 is a deficient number, since it is larger than the sum of its proper divisors (105217).

20269439 is a wasteful number, since it uses less digits than its factorization.

20269439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105216.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 20269439 is about 4502.1593707909. The cubic root of 20269439 is about 272.6552783333.

The spelling of 20269439 in words is "twenty million, two hundred sixty-nine thousand, four hundred thirty-nine".