20665883520 has 192 divisors, whose sum is σ = 75118165200. Its totient is φ = 5220827136.

The previous prime is 20665883509. The next prime is 20665883527. The reversal of 20665883520 is 2538856602.

20665883520 is a `hidden beast` number, since 2 + 0 + 66 + 588 + 3 + 5 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20665883527) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15024 + ... + 203856.

Almost surely, 2^20665883520 is an apocalyptic number.

20665883520 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 20665883520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37559082600).

20665883520 is an abundant number, since it is smaller than the sum of its proper divisors (54452281680).

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

20665883520 is a wasteful number, since it uses less digits than its factorization.

20665883520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188877 (or 188862 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The spelling of 20665883520 in words is "twenty billion, six hundred sixty-five million, eight hundred eighty-three thousand, five hundred twenty".