20506515027 has 4 divisors (see below), whose sum is σ = 27342020040. Its totient is φ = 13671010016.

The previous prime is 20506514993. The next prime is 20506515049. The reversal of 20506515027 is 72051560502.

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 20506515027 - 2¹⁸ = 20506252883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20506515067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3417752502 + ... + 3417752507.

It is an arithmetic number, because the mean of its divisors is an integer number (6835505010).

Almost surely, 2^20506515027 is an apocalyptic number.

20506515027 is a deficient number, since it is larger than the sum of its proper divisors (6835505013).

20506515027 is an equidigital number, since it uses as much as digits as its factorization.

20506515027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6835505012.

The product of its (nonzero) digits is 21000, while the sum is 33.

The spelling of 20506515027 in words is "twenty billion, five hundred six million, five hundred fifteen thousand, twenty-seven".