20664504432 has 160 divisors (see below), whose sum is σ = 69684706560. Its totient is φ = 5780263680.

The previous prime is 20664504409. The next prime is 20664504433. The reversal of 20664504432 is 23440546602.

20664504432 is a `hidden beast` number, since 2 + 0 + 6 + 645 + 0 + 4 + 4 + 3 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20664504433) 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 31 ways as a sum of consecutive naturals, for example, 105478 + ... + 229029.

It is an arithmetic number, because the mean of its divisors is an integer number (435529416).

Almost surely, 2^20664504432 is an apocalyptic number.

20664504432 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20664504432 is an abundant number, since it is smaller than the sum of its proper divisors (49020202128).

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

20664504432 is a wasteful number, since it uses less digits than its factorization.

20664504432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334548 (or 334536 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 36.

The spelling of 20664504432 in words is "twenty billion, six hundred sixty-four million, five hundred four thousand, four hundred thirty-two".