20365789440 has 144 divisors (see below), whose sum is σ = 65408817600. Its totient is φ = 5400354816.

The previous prime is 20365789403. The next prime is 20365789453. The reversal of 20365789440 is 4498756302.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 20365789440.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 672546 + ... + 702174.

It is an arithmetic number, because the mean of its divisors is an integer number (454227900).

Almost surely, 2^20365789440 is an apocalyptic number.

20365789440 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 20365789440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32704408800).

20365789440 is an abundant number, since it is smaller than the sum of its proper divisors (45043028160).

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

20365789440 is a wasteful number, since it uses less digits than its factorization.

20365789440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29832 (or 29818 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 48.

The spelling of 20365789440 in words is "twenty billion, three hundred sixty-five million, seven hundred eighty-nine thousand, four hundred forty".