11216820 has 24 divisors (see below), whose sum is σ = 31407264. Its totient is φ = 2991136.

The previous prime is 11216819. The next prime is 11216861. The reversal of 11216820 is 2861211.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93414 + ... + 93533.

It is an arithmetic number, because the mean of its divisors is an integer number (1308636).

Almost surely, 2^11216820 is an apocalyptic number.

11216820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11216820 is an abundant number, since it is smaller than the sum of its proper divisors (20190444).

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

11216820 is a wasteful number, since it uses less digits than its factorization.

11216820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186959 (or 186957 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 11216820 is about 3349.1521315103. The cubic root of 11216820 is about 223.8497344668.

The spelling of 11216820 in words is "eleven million, two hundred sixteen thousand, eight hundred twenty".