20320303440 has 40 divisors (see below), whose sum is σ = 62992941408. Its totient is φ = 5418747520.

The previous prime is 20320303363. The next prime is 20320303441. The reversal of 20320303440 is 4430302302.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320303441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42333726 + ... + 42334205.

Almost surely, 2^20320303440 is an apocalyptic number.

20320303440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20320303440 is an abundant number, since it is smaller than the sum of its proper divisors (42672637968).

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

20320303440 is a wasteful number, since it uses less digits than its factorization.

20320303440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84667947 (or 84667941 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 21.

Adding to 20320303440 its reverse (4430302302), we get a palindrome (24750605742).

The spelling of 20320303440 in words is "twenty billion, three hundred twenty million, three hundred three thousand, four hundred forty".