12631820 has 36 divisors (see below), whose sum is σ = 27509664. Its totient is φ = 4872000.

The previous prime is 12631783. The next prime is 12631831. The reversal of 12631820 is 2813621.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16445 + ... + 17195.

Almost surely, 2^12631820 is an apocalyptic number.

12631820 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 12631820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13754832).

12631820 is an abundant number, since it is smaller than the sum of its proper divisors (14877844).

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

12631820 is a wasteful number, since it uses less digits than its factorization.

12631820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818 (or 787 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 12631820 is about 3554.1271783660. The cubic root of 12631820 is about 232.8923962978.

The spelling of 12631820 in words is "twelve million, six hundred thirty-one thousand, eight hundred twenty".