22355220 has 72 divisors (see below), whose sum is σ = 64308384. Its totient is φ = 5801664.

The previous prime is 22355171. The next prime is 22355237. The reversal of 22355220 is 2255322.

It is a super-2 number, since 2×22355220² = 999511722496800, which contains 22 as substring.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 269299 + ... + 269381.

It is an arithmetic number, because the mean of its divisors is an integer number (893172).

Almost surely, 2^22355220 is an apocalyptic number.

22355220 is a gapful number since it is divisible by the number (20) 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 22355220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32154192).

22355220 is an abundant number, since it is smaller than the sum of its proper divisors (41953164).

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

22355220 is a wasteful number, since it uses less digits than its factorization.

22355220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229 (or 160 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 22355220 is about 4728.1307088531. The cubic root of 22355220 is about 281.7039799001.

The spelling of 22355220 in words is "twenty-two million, three hundred fifty-five thousand, two hundred twenty".