20045323440 has 120 divisors (see below), whose sum is σ = 67803524880. Its totient is φ = 5306936832.

The previous prime is 20045323433. The next prime is 20045323453. The reversal of 20045323440 is 4432354002.

20045323440 is a `hidden beast` number, since 200 + 453 + 2 + 3 + 4 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67 + ... + 200226.

It is an arithmetic number, because the mean of its divisors is an integer number (565029374).

Almost surely, 2^20045323440 is an apocalyptic number.

20045323440 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 20045323440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33901762440).

20045323440 is an abundant number, since it is smaller than the sum of its proper divisors (47758201440).

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

20045323440 is a wasteful number, since it uses less digits than its factorization.

20045323440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200451 (or 200442 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 27.

Adding to 20045323440 its reverse (4432354002), we get a palindrome (24477677442).

The spelling of 20045323440 in words is "twenty billion, forty-five million, three hundred twenty-three thousand, four hundred forty".