22611220 has 12 divisors (see below), whose sum is σ = 47483604. Its totient is φ = 9044480.

The previous prime is 22611209. The next prime is 22611221. The reversal of 22611220 is 2211622.

It can be written as a sum of positive squares in 2 ways, for example, as 12988816 + 9622404 = 3604^2 + 3102^2 .

It is a super-2 number, since 2×22611220² = 1022534539776800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22611194 and 22611203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22611221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 565261 + ... + 565300.

It is an arithmetic number, because the mean of its divisors is an integer number (3956967).

Almost surely, 2^22611220 is an apocalyptic number.

22611220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22611220 is an abundant number, since it is smaller than the sum of its proper divisors (24872384).

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

22611220 is a wasteful number, since it uses less digits than its factorization.

22611220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1130570 (or 1130568 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 22611220 is about 4755.1256555427. The cubic root of 22611220 is about 282.7752088739.

Adding to 22611220 its reverse (2211622), we get a palindrome (24822842).

It can be divided in two parts, 2261 and 1220, that added together give a square (3481 = 59²).

The spelling of 22611220 in words is "twenty-two million, six hundred eleven thousand, two hundred twenty".