20660442643 has 8 divisors (see below), whose sum is σ = 20888409600. Its totient is φ = 20433121800.

The previous prime is 20660442637. The next prime is 20660442659. The reversal of 20660442643 is 34624406602.

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 20660442643 - 2²⁵ = 20626888211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20660442613) 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, 97083 + ... + 225268.

It is an arithmetic number, because the mean of its divisors is an integer number (2611051200).

Almost surely, 2^20660442643 is an apocalyptic number.

20660442643 is a deficient number, since it is larger than the sum of its proper divisors (227966957).

20660442643 is a wasteful number, since it uses less digits than its factorization.

20660442643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323057.

The product of its (nonzero) digits is 165888, while the sum is 37.

The spelling of 20660442643 in words is "twenty billion, six hundred sixty million, four hundred forty-two thousand, six hundred forty-three".