20527319905 has 4 divisors (see below), whose sum is σ = 24632783892. Its totient is φ = 16421855920.

The previous prime is 20527319863. The next prime is 20527319909. The reversal of 20527319905 is 50991372502.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15424646416 + 5102673489 = 124196^2 + 71433^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20527319905 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20527319909) 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, 2052731986 + ... + 2052731995.

It is an arithmetic number, because the mean of its divisors is an integer number (6158195973).

Almost surely, 2^20527319905 is an apocalyptic number.

It is an amenable number.

20527319905 is a deficient number, since it is larger than the sum of its proper divisors (4105463987).

20527319905 is an equidigital number, since it uses as much as digits as its factorization.

20527319905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4105463986.

The product of its (nonzero) digits is 170100, while the sum is 43.

The spelling of 20527319905 in words is "twenty billion, five hundred twenty-seven million, three hundred nineteen thousand, nine hundred five".