31320231420 has 192 divisors, whose sum is σ = 93579494400. Its totient is φ = 7813908480.

The previous prime is 31320231337. The next prime is 31320231421. The reversal of 31320231420 is 2413202313.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320231421) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7286712 + ... + 7291008.

It is an arithmetic number, because the mean of its divisors is an integer number (487393200).

Almost surely, 2^31320231420 is an apocalyptic number.

31320231420 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 31320231420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46789747200).

31320231420 is an abundant number, since it is smaller than the sum of its proper divisors (62259262980).

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

31320231420 is a wasteful number, since it uses less digits than its factorization.

31320231420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4468 (or 4466 counting only the distinct ones).

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

Adding to 31320231420 its reverse (2413202313), we get a palindrome (33733433733).

The spelling of 31320231420 in words is "thirty-one billion, three hundred twenty million, two hundred thirty-one thousand, four hundred twenty".