20426 has 8 divisors (see below), whose sum is σ = 35040. Its totient is φ = 8748.

The previous prime is 20411. The next prime is 20431. The reversal of 20426 is 62402.

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

It is a Harshad number since it is a multiple of its sum of digits (14), and also a Moran number because the ratio is a prime number: 1459 = 20426 / (2 + 0 + 4 + 2 + 6).

It is a Curzon number.

It is a nialpdrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 20426.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 20426.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 716 + ... + 743.

It is an arithmetic number, because the mean of its divisors is an integer number (4380).

2²⁰⁴²⁶ is an apocalyptic number.

20426 is a deficient number, since it is larger than the sum of its proper divisors (14614).

20426 is a wasteful number, since it uses less digits than its factorization.

20426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1468.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 20426 is about 142.9195577939. The cubic root of 20426 is about 27.3355474444.

Adding to 20426 its reverse (62402), we get a palindrome (82828).

It can be divided in two parts, 2042 and 6, that added together give a 11-th power (2048 = 2¹¹).

The spelling of 20426 in words is "twenty thousand, four hundred twenty-six".