22011220 has 48 divisors (see below), whose sum is σ = 57633408. Its totient is φ = 6860160.

The previous prime is 22011211. The next prime is 22011221. The reversal of 22011220 is 2211022.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 22011197 and 22011206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22011221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5607 + ... + 8686.

It is an arithmetic number, because the mean of its divisors is an integer number (1200696).

Almost surely, 2^22011220 is an apocalyptic number.

22011220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22011220 is an abundant number, since it is smaller than the sum of its proper divisors (35622188).

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

22011220 is a wasteful number, since it uses less digits than its factorization.

22011220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14320 (or 14318 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 22011220 is about 4691.6116633839. The cubic root of 22011220 is about 280.2515596386.

Adding to 22011220 its reverse (2211022), we get a palindrome (24222242).

The spelling of 22011220 in words is "twenty-two million, eleven thousand, two hundred twenty".