20338 has 4 divisors (see below), whose sum is σ = 30510. Its totient is φ = 10168.

The previous prime is 20333. The next prime is 20341. The reversal of 20338 is 83302.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83302 = 2 ⋅41651.

It can be written as a sum of positive squares in only one way, i.e., 12769 + 7569 = 113^2 + 87^2 .

It is not an unprimeable number, because it can be changed into a prime (20333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5083 + ... + 5086.

2²⁰³³⁸ is an apocalyptic number.

20338 is a deficient number, since it is larger than the sum of its proper divisors (10172).

20338 is a wasteful number, since it uses less digits than its factorization.

20338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10171.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 20338 is about 142.6113599963. The cubic root of 20338 is about 27.2962349506.

The spelling of 20338 in words is "twenty thousand, three hundred thirty-eight".