2320721920 has 144 divisors (see below), whose sum is σ = 6123875940. Its totient is φ = 843448320.

The previous prime is 2320721891. The next prime is 2320721939. The reversal of 2320721920 is 291270232.

It can be written as a sum of positive squares in 2 ways, for example, as 1998447616 + 322274304 = 44704^2 + 17952^2 .

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1238104 + ... + 1239976.

Almost surely, 2^2320721920 is an apocalyptic number.

2320721920 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 2320721920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3061937970).

2320721920 is an abundant number, since it is smaller than the sum of its proper divisors (3803154020).

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

2320721920 is a wasteful number, since it uses less digits than its factorization.

2320721920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1922 (or 1891 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 2320721920 is about 48173.8717563785. The cubic root of 2320721920 is about 1323.9584875768.

The spelling of 2320721920 in words is "two billion, three hundred twenty million, seven hundred twenty-one thousand, nine hundred twenty".