20315231515 has 8 divisors (see below), whose sum is σ = 24838245648. Its totient is φ = 15945540000.

The previous prime is 20315231501. The next prime is 20315231527. The reversal of 20315231515 is 51513251302.

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

It is not a de Polignac number, because 20315231515 - 2⁵ = 20315231483 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 (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38330361 + ... + 38330890.

It is an arithmetic number, because the mean of its divisors is an integer number (3104780706).

Almost surely, 2^20315231515 is an apocalyptic number.

20315231515 is a deficient number, since it is larger than the sum of its proper divisors (4523014133).

20315231515 is an equidigital number, since it uses as much as digits as its factorization.

20315231515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76661309.

The product of its (nonzero) digits is 4500, while the sum is 28.

Adding to 20315231515 its reverse (51513251302), we get a palindrome (71828482817).

The spelling of 20315231515 in words is "twenty billion, three hundred fifteen million, two hundred thirty-one thousand, five hundred fifteen".