20500115005 has 8 divisors (see below), whose sum is σ = 25200141624. Its totient is φ = 16000089600.

The previous prime is 20500114991. The next prime is 20500115021. The reversal of 20500115005 is 50051100502.

It can be written as a sum of positive squares in 4 ways, for example, as 858372804 + 19641742201 = 29298^2 + 140149^2 .

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

It is not a de Polignac number, because 20500115005 - 2⁹ = 20500114493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50000076 + ... + 50000485.

It is an arithmetic number, because the mean of its divisors is an integer number (3150017703).

Almost surely, 2^20500115005 is an apocalyptic number.

It is an amenable number.

20500115005 is a deficient number, since it is larger than the sum of its proper divisors (4700026619).

20500115005 is a wasteful number, since it uses less digits than its factorization.

20500115005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100000607.

The product of its (nonzero) digits is 250, while the sum is 19.

Adding to 20500115005 its reverse (50051100502), we get a palindrome (70551215507).

The spelling of 20500115005 in words is "twenty billion, five hundred million, one hundred fifteen thousand, five".