20344340543565 has 16 divisors (see below), whose sum is σ = 32866973463168. Its totient is φ = 10744972092096.

The previous prime is 20344340543563. The next prime is 20344340543587. The reversal of 20344340543565 is 56534504344302.

It is not a de Polignac number, because 20344340543565 - 2¹ = 20344340543563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20344340543563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6583927434 + ... + 6583930523.

It is an arithmetic number, because the mean of its divisors is an integer number (2054185841448).

Almost surely, 2^{20344340543565} is an apocalyptic number.

It is an amenable number.

20344340543565 is a deficient number, since it is larger than the sum of its proper divisors (12522632919603).

20344340543565 is a wasteful number, since it uses less digits than its factorization.

20344340543565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13167858068.

The product of its (nonzero) digits is 10368000, while the sum is 48.

Adding to 20344340543565 its reverse (56534504344302), we get a palindrome (76878844887867).

The spelling of 20344340543565 in words is "twenty trillion, three hundred forty-four billion, three hundred forty million, five hundred forty-three thousand, five hundred sixty-five".