20646001323943 has 2 divisors, whose sum is σ = 20646001323944. Its totient is φ = 20646001323942.

The previous prime is 20646001323919. The next prime is 20646001324037. The reversal of 20646001323943 is 34932310064602.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20646001323943 is a prime.

It is a super-2 number, since 2×20646001323943² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20646001323943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20646001323043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10323000661971 + 10323000661972.

It is an arithmetic number, because the mean of its divisors is an integer number (10323000661972).

Almost surely, 2^{20646001323943} is an apocalyptic number.

20646001323943 is a deficient number, since it is larger than the sum of its proper divisors (1).

20646001323943 is an equidigital number, since it uses as much as digits as its factorization.

20646001323943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 43.

The spelling of 20646001323943 in words is "twenty trillion, six hundred forty-six billion, one million, three hundred twenty-three thousand, nine hundred forty-three".