20664064464 has 20 divisors (see below), whose sum is σ = 53382166656. Its totient is φ = 6888021472.

The previous prime is 20664064453. The next prime is 20664064481. The reversal of 20664064464 is 46446046602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215250624 + ... + 215250719.

Almost surely, 2^20664064464 is an apocalyptic number.

20664064464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20664064464 is an abundant number, since it is smaller than the sum of its proper divisors (32718102192).

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

20664064464 is a wasteful number, since it uses less digits than its factorization.

20664064464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430501354 (or 430501348 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 42.

The spelling of 20664064464 in words is "twenty billion, six hundred sixty-four million, sixty-four thousand, four hundred sixty-four".