31231343220 has 192 divisors, whose sum is σ = 110106888192. Its totient is φ = 6425280000.

The previous prime is 31231343179. The next prime is 31231343243. The reversal of 31231343220 is 2234313213.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 433155 + ... + 500085.

It is an arithmetic number, because the mean of its divisors is an integer number (573473376).

Almost surely, 2^31231343220 is an apocalyptic number.

31231343220 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 31231343220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55053444096).

31231343220 is an abundant number, since it is smaller than the sum of its proper divisors (78875544972).

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

31231343220 is a wasteful number, since it uses less digits than its factorization.

31231343220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67062 (or 67060 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 24.

Adding to 31231343220 its reverse (2234313213), we get a palindrome (33465656433).

The spelling of 31231343220 in words is "thirty-one billion, two hundred thirty-one million, three hundred forty-three thousand, two hundred twenty".