20494 has 4 divisors (see below), whose sum is σ = 30744. Its totient is φ = 10246.

The previous prime is 20483. The next prime is 20507. The reversal of 20494 is 49402.

20494 is nontrivially palindromic in base 11.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5122 + ... + 5125.

It is an arithmetic number, because the mean of its divisors is an integer number (7686).

2²⁰⁴⁹⁴ is an apocalyptic number.

20494 is a deficient number, since it is larger than the sum of its proper divisors (10250).

20494 is a wasteful number, since it uses less digits than its factorization.

20494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10249.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 20494 is about 143.1572561905. The cubic root of 20494 is about 27.3658480141.

Adding to 20494 its reverse (49402), we get a palindrome (69896).

The spelling of 20494 in words is "twenty thousand, four hundred ninety-four".