20105102511313 has 4 divisors (see below), whose sum is σ = 20331002539620. Its totient is φ = 19879202483008.

The previous prime is 20105102511233. The next prime is 20105102511343. The reversal of 20105102511313 is 31311520150102.

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 14321327628609 + 5783774882704 = 3784353^2 + 2404948^2 .

It is a cyclic number.

It is not a de Polignac number, because 20105102511313 - 2¹⁷ = 20105102380241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20105102511343) 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, 112950014020 + ... + 112950014197.

It is an arithmetic number, because the mean of its divisors is an integer number (5082750634905).

Almost surely, 2^{20105102511313} is an apocalyptic number.

It is an amenable number.

20105102511313 is a deficient number, since it is larger than the sum of its proper divisors (225900028307).

20105102511313 is an equidigital number, since it uses as much as digits as its factorization.

20105102511313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225900028306.

The product of its (nonzero) digits is 900, while the sum is 25.

Adding to 20105102511313 its reverse (31311520150102), we get a palindrome (51416622661415).

The spelling of 20105102511313 in words is "twenty trillion, one hundred five billion, one hundred two million, five hundred eleven thousand, three hundred thirteen".