31304312220 has 96 divisors (see below), whose sum is σ = 92407150080. Its totient is φ = 7896303360.

The previous prime is 31304312197. The next prime is 31304312257. The reversal of 31304312220 is 2221340313.

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, 732769 + ... + 774311.

It is an arithmetic number, because the mean of its divisors is an integer number (962574480).

Almost surely, 2^31304312220 is an apocalyptic number.

31304312220 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 31304312220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46203575040).

31304312220 is an abundant number, since it is smaller than the sum of its proper divisors (61102837860).

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

31304312220 is a wasteful number, since it uses less digits than its factorization.

31304312220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42235 (or 42233 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 31304312220 its reverse (2221340313), we get a palindrome (33525652533).

The spelling of 31304312220 in words is "thirty-one billion, three hundred four million, three hundred twelve thousand, two hundred twenty".