20344341521663 has 4 divisors (see below), whose sum is σ = 20344459375560. Its totient is φ = 20344223667768.

The previous prime is 20344341521641. The next prime is 20344341521683. The reversal of 20344341521663 is 36612514344302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20344341521663 - 2²⁰ = 20344340473087 is a prime.

It is a super-2 number, since 2×20344341521663² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20344341521683) 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, 58667633 + ... + 59013386.

It is an arithmetic number, because the mean of its divisors is an integer number (5086114843890).

Almost surely, 2^{20344341521663} is an apocalyptic number.

20344341521663 is a deficient number, since it is larger than the sum of its proper divisors (117853897).

20344341521663 is a wasteful number, since it uses less digits than its factorization.

20344341521663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117853896.

The product of its (nonzero) digits is 1244160, while the sum is 44.

Adding to 20344341521663 its reverse (36612514344302), we get a palindrome (56956855865965).

The spelling of 20344341521663 in words is "twenty trillion, three hundred forty-four billion, three hundred forty-one million, five hundred twenty-one thousand, six hundred sixty-three".