20130312320 has 192 divisors, whose sum is σ = 50008233600. Its totient is φ = 7746785280.

The previous prime is 20130312311. The next prime is 20130312331. The reversal of 20130312320 is 2321303102.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 188133707 + ... + 188133813.

It is an arithmetic number, because the mean of its divisors is an integer number (260459550).

Almost surely, 2^20130312320 is an apocalyptic number.

20130312320 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 20130312320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25004116800).

20130312320 is an abundant number, since it is smaller than the sum of its proper divisors (29877921280).

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

20130312320 is an equidigital number, since it uses as much as digits as its factorization.

20130312320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327 (or 254 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 20130312320 its reverse (2321303102), we get a palindrome (22451615422).

The spelling of 20130312320 in words is "twenty billion, one hundred thirty million, three hundred twelve thousand, three hundred twenty".