20105404013 has 4 divisors (see below), whose sum is σ = 20116953948. Its totient is φ = 20093854080.

The previous prime is 20105404009. The next prime is 20105404037. The reversal of 20105404013 is 31040450102.

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 744907849 + 19360496164 = 27293^2 + 139142^2 .

It is a cyclic number.

It is not a de Polignac number, because 20105404013 - 2² = 20105404009 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20105404073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5772356 + ... + 5775837.

It is an arithmetic number, because the mean of its divisors is an integer number (5029238487).

Almost surely, 2^20105404013 is an apocalyptic number.

It is an amenable number.

20105404013 is a deficient number, since it is larger than the sum of its proper divisors (11549935).

20105404013 is a wasteful number, since it uses less digits than its factorization.

20105404013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11549934.

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 20105404013 its reverse (31040450102), we get a palindrome (51145854115).

The spelling of 20105404013 in words is "twenty billion, one hundred five million, four hundred four thousand, thirteen".