20305243513 has 16 divisors (see below), whose sum is σ = 22693029120. Its totient is φ = 18055547136.

The previous prime is 20305243507. The next prime is 20305243531. The reversal of 20305243513 is 31534250302.

It is not a de Polignac number, because 20305243513 - 2²¹ = 20303146361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20305223513) by changing a digit.

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, 32895 + ... + 204187.

It is an arithmetic number, because the mean of its divisors is an integer number (1418314320).

Almost surely, 2^20305243513 is an apocalyptic number.

It is an amenable number.

20305243513 is a deficient number, since it is larger than the sum of its proper divisors (2387785607).

20305243513 is a wasteful number, since it uses less digits than its factorization.

20305243513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171696.

The product of its (nonzero) digits is 10800, while the sum is 28.

Adding to 20305243513 its reverse (31534250302), we get a palindrome (51839493815).

The spelling of 20305243513 in words is "twenty billion, three hundred five million, two hundred forty-three thousand, five hundred thirteen".