20664894168 has 24 divisors (see below), whose sum is σ = 55967421900. Its totient is φ = 6888298032.

The previous prime is 20664894167. The next prime is 20664894179. The reversal of 20664894168 is 86149846602.

20664894168 is a `hidden beast` number, since 2 + 0 + 66 + 489 + 41 + 68 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20664894167) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 143506138 + ... + 143506281.

Almost surely, 2^20664894168 is an apocalyptic number.

It is an amenable number.

20664894168 is an abundant number, since it is smaller than the sum of its proper divisors (35302527732).

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

20664894168 is a wasteful number, since it uses less digits than its factorization.

20664894168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287012431 (or 287012424 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 54.

The spelling of 20664894168 in words is "twenty billion, six hundred sixty-four million, eight hundred ninety-four thousand, one hundred sixty-eight".