20344653721271 has 16 divisors (see below), whose sum is σ = 22667368900608. Its totient is φ = 18100839607200.

The previous prime is 20344653721201. The next prime is 20344653721283. The reversal of 20344653721271 is 17212735644302.

It is a cyclic number.

It is not a de Polignac number, because 20344653721271 - 2¹⁸ = 20344653459127 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20344653721201) 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, 11219906 + ... + 12906416.

It is an arithmetic number, because the mean of its divisors is an integer number (1416710556288).

Almost surely, 2^{20344653721271} is an apocalyptic number.

20344653721271 is a deficient number, since it is larger than the sum of its proper divisors (2322715179337).

20344653721271 is a wasteful number, since it uses less digits than its factorization.

20344653721271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1709902.

The product of its (nonzero) digits is 1693440, while the sum is 47.

The spelling of 20344653721271 in words is "twenty trillion, three hundred forty-four billion, six hundred fifty-three million, seven hundred twenty-one thousand, two hundred seventy-one".