20308684 has 12 divisors (see below), whose sum is σ = 38771208. Its totient is φ = 9231200.

The previous prime is 20308681. The next prime is 20308723. The reversal of 20308684 is 48680302.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20308681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230737 + ... + 230824.

It is an arithmetic number, because the mean of its divisors is an integer number (3230934).

Almost surely, 2^20308684 is an apocalyptic number.

It is an amenable number.

20308684 is a deficient number, since it is larger than the sum of its proper divisors (18462524).

20308684 is a wasteful number, since it uses less digits than its factorization.

20308684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461576 (or 461574 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 20308684 is about 4506.5157272554. The cubic root of 20308684 is about 272.8311335199.

Adding to 20308684 its reverse (48680302), we get a palindrome (68988986).

The spelling of 20308684 in words is "twenty million, three hundred eight thousand, six hundred eighty-four".