20467 has 4 divisors (see below), whose sum is σ = 20776. Its totient is φ = 20160.

The previous prime is 20443. The next prime is 20477. The reversal of 20467 is 76402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76402 = 2 ⋅38201.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20467 is a prime.

It is a Duffinian number.

It is a plaindrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (20407) 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, 9 + ... + 202.

It is an arithmetic number, because the mean of its divisors is an integer number (5194).

2²⁰⁴⁶⁷ is an apocalyptic number.

20467 is a deficient number, since it is larger than the sum of its proper divisors (309).

20467 is an equidigital number, since it uses as much as digits as its factorization.

20467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 20467 is about 143.0629232191. The cubic root of 20467 is about 27.3538249404.

Adding to 20467 its reverse (76402), we get a palindrome (96869).

The spelling of 20467 in words is "twenty thousand, four hundred sixty-seven".