12631320 has 96 divisors (see below), whose sum is σ = 44226000. Its totient is φ = 3108096.

The previous prime is 12631303. The next prime is 12631337. The reversal of 12631320 is 2313621.

12631320 is a `hidden beast` number, since 1 + 2 + 631 + 32 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (12631303) and next prime (12631337).

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 = 12631293 and 12631302.

It is a congruent number.

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, 3331 + ... + 6029.

Almost surely, 2^12631320 is an apocalyptic number.

12631320 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 12631320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22113000).

12631320 is an abundant number, since it is smaller than the sum of its proper divisors (31594680).

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

12631320 is a wasteful number, since it uses less digits than its factorization.

12631320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2729 (or 2722 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 12631320 is about 3554.0568369119. The cubic root of 12631320 is about 232.8893234301.

Adding to 12631320 its reverse (2313621), we get a palindrome (14944941).

The spelling of 12631320 in words is "twelve million, six hundred thirty-one thousand, three hundred twenty".