20413525516645 has 4 divisors (see below), whose sum is σ = 24496230619980. Its totient is φ = 16330820413312.

The previous prime is 20413525516621. The next prime is 20413525516673. The reversal of 20413525516645 is 54661552531402.

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 15160362364161 + 5253163152484 = 3893631^2 + 2291978^2 .

It is a cyclic number.

It is not a de Polignac number, because 20413525516645 - 2⁹ = 20413525516133 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2041352551660 + ... + 2041352551669.

It is an arithmetic number, because the mean of its divisors is an integer number (6124057654995).

Almost surely, 2^{20413525516645} is an apocalyptic number.

It is an amenable number.

20413525516645 is a deficient number, since it is larger than the sum of its proper divisors (4082705103335).

20413525516645 is an equidigital number, since it uses as much as digits as its factorization.

20413525516645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4082705103334.

The product of its (nonzero) digits is 4320000, while the sum is 49.

The spelling of 20413525516645 in words is "twenty trillion, four hundred thirteen billion, five hundred twenty-five million, five hundred sixteen thousand, six hundred forty-five".