11220220 has 24 divisors (see below), whose sum is σ = 25705008. Its totient is φ = 4080000.

The previous prime is 11220211. The next prime is 11220227. The reversal of 11220220 is 2202211.

11220220 = T₂₀₃ + T₂₀₄ + ... + T₄₂₂.

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 = 11220197 and 11220206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11220227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25281 + ... + 25720.

It is an arithmetic number, because the mean of its divisors is an integer number (1071042).

Almost surely, 2^11220220 is an apocalyptic number.

11220220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11220220 is an abundant number, since it is smaller than the sum of its proper divisors (14484788).

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

11220220 is a wasteful number, since it uses less digits than its factorization.

11220220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51021 (or 51019 counting only the distinct ones).

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

The square root of 11220220 is about 3349.6596842067. The cubic root of 11220220 is about 223.8723496765.

Adding to 11220220 its reverse (2202211), we get a palindrome (13422431).

Subtracting from 11220220 its reverse (2202211), we obtain a square (9018009 = 3003²).

It can be divided in two parts, 1 and 1220220, that added together give a palindrome (1220221).

The spelling of 11220220 in words is "eleven million, two hundred twenty thousand, two hundred twenty".