20466 has 16 divisors (see below), whose sum is σ = 45600. Its totient is φ = 6804.

The previous prime is 20443. The next prime is 20477. The reversal of 20466 is 66402.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a plaindrome in base 7.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136 + ... + 243.

It is an arithmetic number, because the mean of its divisors is an integer number (2850).

2²⁰⁴⁶⁶ is an apocalyptic number.

20466 is an abundant number, since it is smaller than the sum of its proper divisors (25134).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22800).

20466 is a wasteful number, since it uses less digits than its factorization.

20466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390 (or 384 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 20466 is about 143.0594282108. The cubic root of 20466 is about 27.3533794384.

Adding to 20466 its reverse (66402), we get a palindrome (86868).

The spelling of 20466 in words is "twenty thousand, four hundred sixty-six".