20346 has 8 divisors (see below), whose sum is σ = 40704. Its totient is φ = 6780.

The previous prime is 20341. The next prime is 20347. The reversal of 20346 is 64302.

It is a sphenic number, since it is the product of 3 distinct primes.

20346 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1690 + ... + 1701.

It is an arithmetic number, because the mean of its divisors is an integer number (5088).

2²⁰³⁴⁶ is an apocalyptic number.

20346 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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 (20352).

20346 is a wasteful number, since it uses less digits than its factorization.

20346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3396.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 20346 is about 142.6394054951. The cubic root of 20346 is about 27.2998134941.

Subtracting from 20346 its product of nonzero digits (144), we obtain a palindrome (20202).

Adding to 20346 its reverse (64302), we get a palindrome (84648).

Subtracting 20346 from its reverse (64302), we obtain a triangular number (43956 = T₂₉₆).

The spelling of 20346 in words is "twenty thousand, three hundred forty-six".