11556920 has 48 divisors (see below), whose sum is σ = 26769960. Its totient is φ = 4489664.

The previous prime is 11556911. The next prime is 11556931. The reversal of 11556920 is 2965511.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 139199 + ... + 139281.

Almost surely, 2^11556920 is an apocalyptic number.

11556920 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 11556920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13384980).

11556920 is an abundant number, since it is smaller than the sum of its proper divisors (15213040).

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

11556920 is an equidigital number, since it uses as much as digits as its factorization.

11556920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 29.

The square root of 11556920 is about 3399.5470286496. The cubic root of 11556920 is about 226.0896608244.

The spelling of 11556920 in words is "eleven million, five hundred fifty-six thousand, nine hundred twenty".