20315340305 has 16 divisors (see below), whose sum is σ = 26894007504. Its totient is φ = 14636190720.

The previous prime is 20315340233. The next prime is 20315340317. The reversal of 20315340305 is 50304351302.

It can be written as a sum of positive squares in 8 ways, for example, as 8678971921 + 11636368384 = 93161^2 + 107872^2 .

It is not a de Polignac number, because 20315340305 - 2⁸ = 20315340049 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 3808844 + ... + 3814173.

It is an arithmetic number, because the mean of its divisors is an integer number (1680875469).

Almost surely, 2^20315340305 is an apocalyptic number.

It is an amenable number.

20315340305 is a deficient number, since it is larger than the sum of its proper divisors (6578667199).

20315340305 is a wasteful number, since it uses less digits than its factorization.

20315340305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7623076.

The product of its (nonzero) digits is 5400, while the sum is 26.

Adding to 20315340305 its reverse (50304351302), we get a palindrome (70619691607).

The spelling of 20315340305 in words is "twenty billion, three hundred fifteen million, three hundred forty thousand, three hundred five".