20865232000 has 384 divisors, whose sum is σ = 56882217600. Its totient is φ = 7594752000.

The previous prime is 20865231973. The next prime is 20865232009. The reversal of 20865232000 is 23256802.

It is a self number, because there is not a number n which added to its sum of digits gives 20865232000.

It is not an unprimeable number, because it can be changed into a prime (20865232009) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 353647971 + ... + 353648029.

It is an arithmetic number, because the mean of its divisors is an integer number (148130775).

Almost surely, 2^20865232000 is an apocalyptic number.

20865232000 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 20865232000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28441108800).

20865232000 is an abundant number, since it is smaller than the sum of its proper divisors (36016985600).

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

20865232000 is an equidigital number, since it uses as much as digits as its factorization.

20865232000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 20865232000 its reverse (23256802), we get a palindrome (20888488802).

The spelling of 20865232000 in words is "twenty billion, eight hundred sixty-five million, two hundred thirty-two thousand".