20015515332413 has 16 divisors (see below), whose sum is σ = 20584724372784. Its totient is φ = 19447802565120.

The previous prime is 20015515332409. The next prime is 20015515332419. The reversal of 20015515332413 is 31423351551002.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 9708571076164 + 10306944256249 = 3115858^2 + 3210443^2 .

It is a cyclic number.

It is not a de Polignac number, because 20015515332413 - 2² = 20015515332409 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 (20015515332419) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159148031 + ... + 159273747.

It is an arithmetic number, because the mean of its divisors is an integer number (1286545273299).

Almost surely, 2^{20015515332413} is an apocalyptic number.

It is an amenable number.

20015515332413 is a deficient number, since it is larger than the sum of its proper divisors (569209040371).

20015515332413 is a wasteful number, since it uses less digits than its factorization.

20015515332413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131632.

The product of its (nonzero) digits is 54000, while the sum is 35.

Adding to 20015515332413 its reverse (31423351551002), we get a palindrome (51438866883415).

The spelling of 20015515332413 in words is "twenty trillion, fifteen billion, five hundred fifteen million, three hundred thirty-two thousand, four hundred thirteen".