20469 has 4 divisors (see below), whose sum is σ = 27296. Its totient is φ = 13644.

The previous prime is 20443. The next prime is 20477. The reversal of 20469 is 96402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20469 - 2⁷ = 20341 is a prime.

It is a super-2 number, since 2×20469² = 837959922, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 5.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20479) 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, 3409 + ... + 3414.

It is an arithmetic number, because the mean of its divisors is an integer number (6824).

2²⁰⁴⁶⁹ is an apocalyptic number.

It is an amenable number.

20469 is a deficient number, since it is larger than the sum of its proper divisors (6827).

20469 is an equidigital number, since it uses as much as digits as its factorization.

20469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6826.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 20469 is about 143.0699129796. The cubic root of 20469 is about 27.3547159010.

The spelling of 20469 in words is "twenty thousand, four hundred sixty-nine".