20315334521453 has 4 divisors (see below), whose sum is σ = 20351807294940. Its totient is φ = 20278861747968.

The previous prime is 20315334521431. The next prime is 20315334521467. The reversal of 20315334521453 is 35412543351302.

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 6157852176004 + 14157482345449 = 2481502^2 + 3762643^2 .

It is a cyclic number.

It is not a de Polignac number, because 20315334521453 - 2⁶ = 20315334521389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20315334521453.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20315334521413) 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 3 ways as a sum of consecutive naturals, for example, 18236385908 + ... + 18236387021.

It is an arithmetic number, because the mean of its divisors is an integer number (5087951823735).

Almost surely, 2^{20315334521453} is an apocalyptic number.

It is an amenable number.

20315334521453 is a deficient number, since it is larger than the sum of its proper divisors (36472773487).

20315334521453 is an equidigital number, since it uses as much as digits as its factorization.

20315334521453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36472773486.

The product of its (nonzero) digits is 648000, while the sum is 41.

Adding to 20315334521453 its reverse (35412543351302), we get a palindrome (55727877872755).

The spelling of 20315334521453 in words is "twenty trillion, three hundred fifteen billion, three hundred thirty-four million, five hundred twenty-one thousand, four hundred fifty-three".