20506515063 has 8 divisors (see below), whose sum is σ = 27750110208. Its totient is φ = 13466964984.

The previous prime is 20506515049. The next prime is 20506515067. The reversal of 20506515063 is 36051560502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20506515063 - 2¹⁴ = 20506498679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20506515067) 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 7 ways as a sum of consecutive naturals, for example, 51011031 + ... + 51011432.

It is an arithmetic number, because the mean of its divisors is an integer number (3468763776).

Almost surely, 2^20506515063 is an apocalyptic number.

20506515063 is a deficient number, since it is larger than the sum of its proper divisors (7243595145).

20506515063 is a wasteful number, since it uses less digits than its factorization.

20506515063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102022533.

The product of its (nonzero) digits is 27000, while the sum is 33.

The spelling of 20506515063 in words is "twenty billion, five hundred six million, five hundred fifteen thousand, sixty-three".