20327645515 has 4 divisors (see below), whose sum is σ = 24393174624. Its totient is φ = 16262116408.

The previous prime is 20327645509. The next prime is 20327645563. The reversal of 20327645515 is 51554672302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20327645515 - 2⁵ = 20327645483 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 3 ways as a sum of consecutive naturals, for example, 2032764547 + ... + 2032764556.

It is an arithmetic number, because the mean of its divisors is an integer number (6098293656).

Almost surely, 2^20327645515 is an apocalyptic number.

20327645515 is a deficient number, since it is larger than the sum of its proper divisors (4065529109).

20327645515 is an equidigital number, since it uses as much as digits as its factorization.

20327645515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4065529108.

The product of its (nonzero) digits is 252000, while the sum is 40.

The spelling of 20327645515 in words is "twenty billion, three hundred twenty-seven million, six hundred forty-five thousand, five hundred fifteen".