20304286 has 8 divisors (see below), whose sum is σ = 30675960. Its totient is φ = 10078968.

The previous prime is 20304281. The next prime is 20304289. The reversal of 20304286 is 68240302.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20304286.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20304281) 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, 36241 + ... + 36796.

It is an arithmetic number, because the mean of its divisors is an integer number (3834495).

Almost surely, 2^20304286 is an apocalyptic number.

20304286 is a deficient number, since it is larger than the sum of its proper divisors (10371674).

20304286 is a wasteful number, since it uses less digits than its factorization.

20304286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73178.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 20304286 is about 4506.0277407047. The cubic root of 20304286 is about 272.8114375456.

Adding to 20304286 its reverse (68240302), we get a palindrome (88544588).

The spelling of 20304286 in words is "twenty million, three hundred four thousand, two hundred eighty-six".