20313031320 has 96 divisors (see below), whose sum is σ = 66083331600. Its totient is φ = 5411394816.

The previous prime is 20313031301. The next prime is 20313031337. The reversal of 20313031320 is 2313031302.

20313031320 is a `hidden beast` number, since 2 + 0 + 313 + 0 + 31 + 320 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20313031293 and 20313031302.

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 23 ways as a sum of consecutive naturals, for example, 339154 + ... + 394526.

Almost surely, 2^20313031320 is an apocalyptic number.

20313031320 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 20313031320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33041665800).

20313031320 is an abundant number, since it is smaller than the sum of its proper divisors (45770300280).

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

20313031320 is a wasteful number, since it uses less digits than its factorization.

20313031320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56409 (or 56402 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Subtracting from 20313031320 its sum of digits (18), we obtain a palindrome (20313031302).

Adding to 20313031320 its reverse (2313031302), we get a palindrome (22626062622).

The spelling of 20313031320 in words is "twenty billion, three hundred thirteen million, thirty-one thousand, three hundred twenty".