20396 has 6 divisors (see below), whose sum is σ = 35700. Its totient is φ = 10196.

The previous prime is 20393. The next prime is 20399. The reversal of 20396 is 69302.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20393) and next prime (20399).

It is not an unprimeable number, because it can be changed into a prime (20393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2546 + ... + 2553.

It is an arithmetic number, because the mean of its divisors is an integer number (5950).

2²⁰³⁹⁶ is an apocalyptic number.

It is an amenable number.

20396 is a deficient number, since it is larger than the sum of its proper divisors (15304).

20396 is a wasteful number, since it uses less digits than its factorization.

20396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5103 (or 5101 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 20396 is about 142.8145650835. The cubic root of 20396 is about 27.3221581655.

Adding to 20396 its reverse (69302), we get a palindrome (89698).

The spelling of 20396 in words is "twenty thousand, three hundred ninety-six".