20344551242565 has 32 divisors (see below), whose sum is σ = 36266031783936. Its totient is φ = 9654151972160.

The previous prime is 20344551242551. The next prime is 20344551242597. The reversal of 20344551242565 is 56524215544302.

It is not a de Polignac number, because 20344551242565 - 2⁹ = 20344551242053 is a prime.

It is a super-2 number, since 2×20344551242565² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1311697677 + ... + 1311713186.

It is an arithmetic number, because the mean of its divisors is an integer number (1133313493248).

Almost surely, 2^{20344551242565} is an apocalyptic number.

It is an amenable number.

20344551242565 is a deficient number, since it is larger than the sum of its proper divisors (15921480541371).

20344551242565 is a wasteful number, since it uses less digits than its factorization.

20344551242565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2623410929.

The product of its (nonzero) digits is 5760000, while the sum is 48.

Adding to 20344551242565 its reverse (56524215544302), we get a palindrome (76868766786867).

The spelling of 20344551242565 in words is "twenty trillion, three hundred forty-four billion, five hundred fifty-one million, two hundred forty-two thousand, five hundred sixty-five".