20384655515 has 16 divisors (see below), whose sum is σ = 27963258048. Its totient is φ = 13974470016.

The previous prime is 20384655509. The next prime is 20384655563. The reversal of 20384655515 is 51555648302.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20384655515 - 2¹⁴ = 20384639131 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67889 + ... + 213021.

It is an arithmetic number, because the mean of its divisors is an integer number (1747703628).

Almost surely, 2^20384655515 is an apocalyptic number.

20384655515 is a deficient number, since it is larger than the sum of its proper divisors (7578602533).

20384655515 is a wasteful number, since it uses less digits than its factorization.

20384655515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149158.

The product of its (nonzero) digits is 720000, while the sum is 44.

The spelling of 20384655515 in words is "twenty billion, three hundred eighty-four million, six hundred fifty-five thousand, five hundred fifteen".