20305000013 has 2 divisors, whose sum is σ = 20305000014. Its totient is φ = 20305000012.

The previous prime is 20304999991. The next prime is 20305000061. The reversal of 20305000013 is 31000050302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12868179844 + 7436820169 = 113438^2 + 86237^2 .

It is a cyclic number.

It is not a de Polignac number, because 20305000013 - 2¹⁶ = 20304934477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20305000063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10152500006 + 10152500007.

It is an arithmetic number, because the mean of its divisors is an integer number (10152500007).

Almost surely, 2^20305000013 is an apocalyptic number.

It is an amenable number.

20305000013 is a deficient number, since it is larger than the sum of its proper divisors (1).

20305000013 is an equidigital number, since it uses as much as digits as its factorization.

20305000013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90, while the sum is 14.

Adding to 20305000013 its reverse (31000050302), we get a palindrome (51305050315).

The spelling of 20305000013 in words is "twenty billion, three hundred five million, thirteen", and thus it is an aban number.