20347 has 2 divisors, whose sum is σ = 20348. Its totient is φ = 20346.

The previous prime is 20341. The next prime is 20353. The reversal of 20347 is 74302.

It is a balanced prime because it is at equal distance from previous prime (20341) and next prime (20353).

It is a cyclic number.

It is not a de Polignac number, because 20347 - 2⁷ = 20219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20347.

It is not a weakly prime, because it can be changed into another prime (20341) 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 as a sum of consecutive naturals, namely, 10173 + 10174.

It is an arithmetic number, because the mean of its divisors is an integer number (10174).

2²⁰³⁴⁷ is an apocalyptic number.

20347 is a deficient number, since it is larger than the sum of its proper divisors (1).

20347 is an equidigital number, since it uses as much as digits as its factorization.

20347 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 16.

The square root of 20347 is about 142.6429107948. The cubic root of 20347 is about 27.3002607461.

Adding to 20347 its reverse (74302), we get a palindrome (94649).

The spelling of 20347 in words is "twenty thousand, three hundred forty-seven", and thus it is an iban number.