20660442645 has 32 divisors (see below), whose sum is σ = 34881580800. Its totient is φ = 10421379584.

The previous prime is 20660442637. The next prime is 20660442659. The reversal of 20660442645 is 54624406602.

It is a cyclic number.

It is not a de Polignac number, because 20660442645 - 2³ = 20660442637 is a prime.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 305730 + ... + 367139.

It is an arithmetic number, because the mean of its divisors is an integer number (1090049400).

Almost surely, 2^20660442645 is an apocalyptic number.

It is an amenable number.

20660442645 is a deficient number, since it is larger than the sum of its proper divisors (14221138155).

20660442645 is a wasteful number, since it uses less digits than its factorization.

20660442645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672989.

The product of its (nonzero) digits is 276480, while the sum is 39.

The spelling of 20660442645 in words is "twenty billion, six hundred sixty million, four hundred forty-two thousand, six hundred forty-five".