11156220 has 36 divisors (see below), whose sum is σ = 33841080. Its totient is φ = 2974944.

The previous prime is 11156207. The next prime is 11156227. The reversal of 11156220 is 2265111.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×11156220² = 248922489376800, which contains 22 as substring.

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 = 11156193 and 11156202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11156227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30810 + ... + 31169.

It is an arithmetic number, because the mean of its divisors is an integer number (940030).

Almost surely, 2^11156220 is an apocalyptic number.

11156220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11156220 is an abundant number, since it is smaller than the sum of its proper divisors (22684860).

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

11156220 is a wasteful number, since it uses less digits than its factorization.

11156220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61994 (or 61989 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 11156220 is about 3340.0928130817. The cubic root of 11156220 is about 223.4458827279.

The spelling of 11156220 in words is "eleven million, one hundred fifty-six thousand, two hundred twenty".