20304687 has 8 divisors (see below), whose sum is σ = 29155504. Its totient is φ = 12495168.

The previous prime is 20304667. The next prime is 20304689. The reversal of 20304687 is 78640302.

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

It is not a de Polignac number, because 20304687 - 2¹⁰ = 20303663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20304689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260278 + ... + 260355.

It is an arithmetic number, because the mean of its divisors is an integer number (3644438).

Almost surely, 2^20304687 is an apocalyptic number.

20304687 is a deficient number, since it is larger than the sum of its proper divisors (8850817).

20304687 is a wasteful number, since it uses less digits than its factorization.

20304687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520649.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 20304687 is about 4506.0722364383. The cubic root of 20304687 is about 272.8132334992.

Adding to 20304687 its reverse (78640302), we get a palindrome (98944989).

The spelling of 20304687 in words is "twenty million, three hundred four thousand, six hundred eighty-seven".