11572220 has 48 divisors (see below), whose sum is σ = 27675648. Its totient is φ = 4023360.

The previous prime is 11572213. The next prime is 11572241. The reversal of 11572220 is 2227511.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 11572192 and 11572201.

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 15 ways as a sum of consecutive naturals, for example, 3917 + ... + 6203.

It is an arithmetic number, because the mean of its divisors is an integer number (576576).

Almost surely, 2^11572220 is an apocalyptic number.

11572220 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 11572220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13837824).

11572220 is an abundant number, since it is smaller than the sum of its proper divisors (16103428).

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

11572220 is a wasteful number, since it uses less digits than its factorization.

11572220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2330 (or 2328 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 11572220 is about 3401.7965841596. The cubic root of 11572220 is about 226.1893888494.

Adding to 11572220 its reverse (2227511), we get a palindrome (13799731).

The spelling of 11572220 in words is "eleven million, five hundred seventy-two thousand, two hundred twenty".