2311431320 has 64 divisors (see below), whose sum is σ = 5972140800. Its totient is φ = 796279680.

The previous prime is 2311431319. The next prime is 2311431407. The reversal of 2311431320 is 231341132.

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 = 2311431292 and 2311431301.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129884 + ... + 146603.

It is an arithmetic number, because the mean of its divisors is an integer number (93314700).

Almost surely, 2^2311431320 is an apocalyptic number.

2311431320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2311431320 is an abundant number, since it is smaller than the sum of its proper divisors (3660709480).

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

2311431320 is a wasteful number, since it uses less digits than its factorization.

2311431320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276528 (or 276524 counting only the distinct ones).

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

The square root of 2311431320 is about 48077.3472645902. The cubic root of 2311431320 is about 1322.1893801079.

Adding to 2311431320 its reverse (231341132), we get a palindrome (2542772452).

The spelling of 2311431320 in words is "two billion, three hundred eleven million, four hundred thirty-one thousand, three hundred twenty".