12031920 has 120 divisors (see below), whose sum is σ = 42827616. Its totient is φ = 3016704.

The previous prime is 12031913. The next prime is 12031931. The reversal of 12031920 is 2913021.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (120).

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 = 12031893 and 12031902.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11749 + ... + 12731.

Almost surely, 2^12031920 is an apocalyptic number.

12031920 is a gapful number since it is divisible by the number (10) 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 12031920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21413808).

12031920 is an abundant number, since it is smaller than the sum of its proper divisors (30795696).

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

12031920 is a wasteful number, since it uses less digits than its factorization.

12031920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019 (or 1010 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 12031920 is about 3468.7058105293. The cubic root of 12031920 is about 229.1456647787.

Adding to 12031920 its reverse (2913021), we get a palindrome (14944941).

The spelling of 12031920 in words is "twelve million, thirty-one thousand, nine hundred twenty".