12991020 has 48 divisors (see below), whose sum is σ = 41572608. Its totient is φ = 2969280.

The previous prime is 12990979. The next prime is 12991037. The reversal of 12991020 is 2019921.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 15046 + ... + 15885.

It is an arithmetic number, because the mean of its divisors is an integer number (866096).

Almost surely, 2^12991020 is an apocalyptic number.

12991020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12991020 is an abundant number, since it is smaller than the sum of its proper divisors (28581588).

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

12991020 is a wasteful number, since it uses less digits than its factorization.

12991020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30950 (or 30948 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 12991020 is about 3604.3057583951. The cubic root of 12991020 is about 235.0793153125.

The spelling of 12991020 in words is "twelve million, nine hundred ninety-one thousand, twenty".