20565355343 has 8 divisors (see below), whose sum is σ = 22148931168. Its totient is φ = 18982011744.

The previous prime is 20565355319. The next prime is 20565355357. The reversal of 20565355343 is 34355356502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20565355343 - 2¹⁶ = 20565289807 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20565355343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20565355303) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 154805 + ... + 255137.

It is an arithmetic number, because the mean of its divisors is an integer number (2768616396).

Almost surely, 2^20565355343 is an apocalyptic number.

20565355343 is a deficient number, since it is larger than the sum of its proper divisors (1583575825).

20565355343 is a wasteful number, since it uses less digits than its factorization.

20565355343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116113.

The product of its (nonzero) digits is 810000, while the sum is 41.

The spelling of 20565355343 in words is "twenty billion, five hundred sixty-five million, three hundred fifty-five thousand, three hundred forty-three".