20238389 has 4 divisors (see below), whose sum is σ = 20307756. Its totient is φ = 20169024.

The previous prime is 20238373. The next prime is 20238391. The reversal of 20238389 is 98383202.

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 16337764 + 3900625 = 4042^2 + 1975^2 .

It is a cyclic number.

It is not a de Polignac number, because 20238389 - 2⁴ = 20238373 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 (20238329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34244 + ... + 34829.

It is an arithmetic number, because the mean of its divisors is an integer number (5076939).

Almost surely, 2^20238389 is an apocalyptic number.

It is an amenable number.

20238389 is a deficient number, since it is larger than the sum of its proper divisors (69367).

20238389 is an equidigital number, since it uses as much as digits as its factorization.

20238389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69366.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 20238389 is about 4498.7097039040. The cubic root of 20238389 is about 272.5159836878.

The spelling of 20238389 in words is "twenty million, two hundred thirty-eight thousand, three hundred eighty-nine".