20655845668 has 24 divisors (see below), whose sum is σ = 38618165600. Its totient is φ = 9638310528.

The previous prime is 20655845653. The next prime is 20655845669. The reversal of 20655845668 is 86654855602.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20655845669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2023173 + ... + 2033356.

Almost surely, 2^20655845668 is an apocalyptic number.

It is an amenable number.

20655845668 is a deficient number, since it is larger than the sum of its proper divisors (17962319932).

20655845668 is a wasteful number, since it uses less digits than its factorization.

20655845668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4056619 (or 4056617 counting only the distinct ones).

The product of its (nonzero) digits is 13824000, while the sum is 55.

The spelling of 20655845668 in words is "twenty billion, six hundred fifty-five million, eight hundred forty-five thousand, six hundred sixty-eight".