11220520 has 16 divisors (see below), whose sum is σ = 25246260. Its totient is φ = 4488192.

The previous prime is 11220491. The next prime is 11220533. The reversal of 11220520 is 2502211.

It can be written as a sum of positive squares in 2 ways, for example, as 9036036 + 2184484 = 3006^2 + 1478^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 11220520.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140217 + ... + 140296.

Almost surely, 2^11220520 is an apocalyptic number.

11220520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11220520 is an abundant number, since it is smaller than the sum of its proper divisors (14025740).

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

11220520 is a wasteful number, since it uses less digits than its factorization.

11220520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280524 (or 280520 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 11220520 is about 3349.7044645759. The cubic root of 11220520 is about 223.8743449168.

Adding to 11220520 its reverse (2502211), we get a palindrome (13722731).

It can be divided in two parts, 112205 and 20, that added together give a square (112225 = 335²).

The spelling of 11220520 in words is "eleven million, two hundred twenty thousand, five hundred twenty".