20664616410 has 96 divisors (see below), whose sum is σ = 56843804160. Its totient is φ = 5193949824.

The previous prime is 20664616397. The next prime is 20664616421. The reversal of 20664616410 is 1461646602.

20664616410 is a `hidden beast` number, since 2 + 0 + 6 + 6 + 4 + 6 + 1 + 641 + 0 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 306199 + ... + 367541.

It is an arithmetic number, because the mean of its divisors is an integer number (592122960).

Almost surely, 2^20664616410 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20664616410, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28421902080).

20664616410 is an abundant number, since it is smaller than the sum of its proper divisors (36179187750).

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

20664616410 is a wasteful number, since it uses less digits than its factorization.

20664616410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61572 (or 61569 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The spelling of 20664616410 in words is "twenty billion, six hundred sixty-four million, six hundred sixteen thousand, four hundred ten".