203112321320 has 64 divisors (see below), whose sum is σ = 463605690240. Its totient is φ = 80071891200.

The previous prime is 203112321299. The next prime is 203112321331. The reversal of 203112321320 is 23123211302.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 203112321292 and 203112321301.

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, 9022799 + ... + 9045281.

It is an arithmetic number, because the mean of its divisors is an integer number (7243838910).

Almost surely, 2^203112321320 is an apocalyptic number.

203112321320 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 203112321320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (231802845120).

203112321320 is an abundant number, since it is smaller than the sum of its proper divisors (260493368920).

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

203112321320 is a wasteful number, since it uses less digits than its factorization.

203112321320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25746 (or 25742 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 203112321320 its reverse (23123211302), we get a palindrome (226235532622).

The spelling of 203112321320 in words is "two hundred three billion, one hundred twelve million, three hundred twenty-one thousand, three hundred twenty".