20511540015 has 32 divisors (see below), whose sum is σ = 33578634240. Its totient is φ = 10686958464.

The previous prime is 20511539999. The next prime is 20511540019. The reversal of 20511540015 is 51004511502.

It is not a de Polignac number, because 20511540015 - 2⁴ = 20511539999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20511540019) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 359041 + ... + 412229.

It is an arithmetic number, because the mean of its divisors is an integer number (1049332320).

Almost surely, 2^20511540015 is an apocalyptic number.

20511540015 is a deficient number, since it is larger than the sum of its proper divisors (13067094225).

20511540015 is a wasteful number, since it uses less digits than its factorization.

20511540015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53791.

The product of its (nonzero) digits is 1000, while the sum is 24.

The spelling of 20511540015 in words is "twenty billion, five hundred eleven million, five hundred forty thousand, fifteen".