20664860000 has 120 divisors (see below), whose sum is σ = 53830050120. Its totient is φ = 7779584000.

The previous prime is 20664859993. The next prime is 20664860023. The reversal of 20664860000 is 6846602.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

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 19 ways as a sum of consecutive naturals, for example, 309611 + ... + 370389.

It is an arithmetic number, because the mean of its divisors is an integer number (448583751).

Almost surely, 2^20664860000 is an apocalyptic number.

20664860000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20664860000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26915025060).

20664860000 is an abundant number, since it is smaller than the sum of its proper divisors (33165190120).

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

20664860000 is an equidigital number, since it uses as much as digits as its factorization.

20664860000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60826 (or 60803 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The spelling of 20664860000 in words is "twenty billion, six hundred sixty-four million, eight hundred sixty thousand".