20665789200 has 540 divisors, whose sum is σ = 86534513520. Its totient is φ = 4722520320.

The previous prime is 20665789187. The next prime is 20665789303. The reversal of 20665789200 is 298756602.

It is a tau number, because it is divible by the number of its divisors (540).

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

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 4760631 + ... + 4764969.

Almost surely, 2^20665789200 is an apocalyptic number.

20665789200 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 20665789200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43267256760).

20665789200 is an abundant number, since it is smaller than the sum of its proper divisors (65868724320).

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

20665789200 is a wasteful number, since it uses less digits than its factorization.

20665789200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4386 (or 4356 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 20665789200 in words is "twenty billion, six hundred sixty-five million, seven hundred eighty-nine thousand, two hundred".