20655845664 has 24 divisors (see below), whose sum is σ = 54221595120. Its totient is φ = 6885281856.

The previous prime is 20655845653. The next prime is 20655845669. The reversal of 20655845664 is 46654855602.

It is a tau number, because it is divible by the number of its divisors (24).

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107582434 + ... + 107582625.

It is an arithmetic number, because the mean of its divisors is an integer number (2259233130).

Almost surely, 2^20655845664 is an apocalyptic number.

20655845664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20655845664 is an abundant number, since it is smaller than the sum of its proper divisors (33565749456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20655845664 is a wasteful number, since it uses less digits than its factorization.

20655845664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215165072 (or 215165064 counting only the distinct ones).

The product of its (nonzero) digits is 6912000, while the sum is 51.

The spelling of 20655845664 in words is "twenty billion, six hundred fifty-five million, eight hundred forty-five thousand, six hundred sixty-four".