20664383357520 has 1600 divisors, whose sum is σ = 87863424000000. Its totient is φ = 4414514577408.

The previous prime is 20664383357509. The next prime is 20664383357543. The reversal of 20664383357520 is 2575338346602.

20664383357520 is a `hidden beast` number, since 2 + 0 + 6 + 6 + 4 + 3 + 83 + 35 + 7 + 520 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 319 ways as a sum of consecutive naturals, for example, 16544741856 + ... + 16544743104.

It is an arithmetic number, because the mean of its divisors is an integer number (54914640000).

Almost surely, 2^{20664383357520} is an apocalyptic number.

20664383357520 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 20664383357520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43931712000000).

20664383357520 is an abundant number, since it is smaller than the sum of its proper divisors (67199040642480).

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

20664383357520 is an equidigital number, since it uses as much as digits as its factorization.

20664383357520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1394 (or 1364 counting only the distinct ones).

The product of its (nonzero) digits is 21772800, while the sum is 54.

The spelling of 20664383357520 in words is "twenty trillion, six hundred sixty-four billion, three hundred eighty-three million, three hundred fifty-seven thousand, five hundred twenty".