20338939 has 4 divisors (see below), whose sum is σ = 20354656. Its totient is φ = 20323224.

The previous prime is 20338933. The next prime is 20338943. The reversal of 20338939 is 93983302.

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 20338939 - 2¹⁹ = 19814651 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20338898 and 20338907.

It is not an unprimeable number, because it can be changed into a prime (20338933) 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, 5724 + ... + 8569.

It is an arithmetic number, because the mean of its divisors is an integer number (5088664).

Almost surely, 2^20338939 is an apocalyptic number.

20338939 is a deficient number, since it is larger than the sum of its proper divisors (15717).

20338939 is a wasteful number, since it uses less digits than its factorization.

20338939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15716.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 20338939 is about 4509.8712841943. The cubic root of 20338939 is about 272.9665503078.

The spelling of 20338939 in words is "twenty million, three hundred thirty-eight thousand, nine hundred thirty-nine".