31323313020 has 96 divisors (see below), whose sum is σ = 90452533248. Its totient is φ = 8094304512.

The previous prime is 31323313019. The next prime is 31323313039. The reversal of 31323313020 is 2031332313.

It is a super-2 number, since 2×31323313020² (a number of 22 digits) contains 22 as substring.

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 31 ways as a sum of consecutive naturals, for example, 279862 + ... + 375458.

It is an arithmetic number, because the mean of its divisors is an integer number (942213888).

Almost surely, 2^31323313020 is an apocalyptic number.

31323313020 is a gapful number since it is divisible by the number (30) 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 31323313020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45226266624).

31323313020 is an abundant number, since it is smaller than the sum of its proper divisors (59129220228).

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

31323313020 is a wasteful number, since it uses less digits than its factorization.

31323313020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95779 (or 95777 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 21.

Adding to 31323313020 its reverse (2031332313), we get a palindrome (33354645333).

The spelling of 31323313020 in words is "thirty-one billion, three hundred twenty-three million, three hundred thirteen thousand, twenty".