20344145256565 has 16 divisors (see below), whose sum is σ = 26850276165888. Its totient is φ = 14703722657856.

The previous prime is 20344145256473. The next prime is 20344145256571. The reversal of 20344145256565 is 56565254144302.

It is a cyclic number.

It is not a de Polignac number, because 20344145256565 - 2²¹ = 20344143159413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 3329644287 + ... + 3329650396.

It is an arithmetic number, because the mean of its divisors is an integer number (1678142260368).

Almost surely, 2^{20344145256565} is an apocalyptic number.

It is an amenable number.

20344145256565 is a deficient number, since it is larger than the sum of its proper divisors (6506130909323).

20344145256565 is a wasteful number, since it uses less digits than its factorization.

20344145256565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6659294748.

The product of its (nonzero) digits is 17280000, while the sum is 52.

The spelling of 20344145256565 in words is "twenty trillion, three hundred forty-four billion, one hundred forty-five million, two hundred fifty-six thousand, five hundred sixty-five".