31320203120 has 80 divisors (see below), whose sum is σ = 73481582592. Its totient is φ = 12414455040.

The previous prime is 31320203099. The next prime is 31320203141. The reversal of 31320203120 is 2130202313.

It is an interprime number because it is at equal distance from previous prime (31320203099) and next prime (31320203141).

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9042509 + ... + 9045971.

Almost surely, 2^31320203120 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31320203120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36740791296).

31320203120 is an abundant number, since it is smaller than the sum of its proper divisors (42161379472).

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

31320203120 is a wasteful number, since it uses less digits than its factorization.

31320203120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4470 (or 4464 counting only the distinct ones).

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

Adding to 31320203120 its reverse (2130202313), we get a palindrome (33450405433).

The spelling of 31320203120 in words is "thirty-one billion, three hundred twenty million, two hundred three thousand, one hundred twenty".