20615430015 has 32 divisors (see below), whose sum is σ = 37501981440. Its totient is φ = 10739197728.

The previous prime is 20615429977. The next prime is 20615430049. The reversal of 20615430015 is 51003451602.

20615430015 is a `hidden beast` number, since 2 + 0 + 615 + 4 + 30 + 0 + 15 = 666.

It is not a de Polignac number, because 20615430015 - 2¹⁴ = 20615413631 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1769857 + ... + 1781466.

It is an arithmetic number, because the mean of its divisors is an integer number (1171936920).

Almost surely, 2^20615430015 is an apocalyptic number.

20615430015 is a deficient number, since it is larger than the sum of its proper divisors (16886551425).

20615430015 is a wasteful number, since it uses less digits than its factorization.

20615430015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3551380 (or 3551374 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 20615430015 its reverse (51003451602), we get a palindrome (71618881617).

The spelling of 20615430015 in words is "twenty billion, six hundred fifteen million, four hundred thirty thousand, fifteen".