31233420 has 144 divisors (see below), whose sum is σ = 102604320.
Its totient is φ = 7661568.
The previous prime is 31233409. The next prime is 31233421. The reversal of 31233420 is 2433213.
Adding to 31233420 its reverse (2433213), we get a palindrome (33666633).
31233420 is a `hidden beast` number, since 312 + 334 + 20 = 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 = 31233393 and 31233402.
It is not an unprimeable number, because it can be changed into a prime (31233421) by changing a digit.
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 47 ways as a sum of consecutive naturals, for example, 180454 + ... + 180626.
It is an arithmetic number, because the mean of its divisors is an integer number (712530).
Almost surely, 231233420 is an apocalyptic number.
31233420 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 31233420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51302160).
31233420 is an abundant number, since it is smaller than the sum of its proper divisors (71370900).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
31233420 is a wasteful number, since it uses less digits than its factorization.
31233420 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 264 (or 259 counting only the distinct ones).
The product of its (nonzero) digits is 432, while the sum is 18.
The square root of 31233420 is about 5588.6867867147.
The cubic root of 31233420 is about 314.9245473098.
The spelling of 31233420 in words is "thirty-one million, two hundred thirty-three thousand, four hundred twenty".