22216420 has 12 divisors (see below), whose sum is σ = 46654524. Its totient is φ = 8886560.

The previous prime is 22216417. The next prime is 22216451. The reversal of 22216420 is 2461222.

It can be written as a sum of positive squares in 2 ways, for example, as 6677056 + 15539364 = 2584^2 + 3942^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 555391 + ... + 555430.

It is an arithmetic number, because the mean of its divisors is an integer number (3887877).

Almost surely, 2^22216420 is an apocalyptic number.

22216420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22216420 is an abundant number, since it is smaller than the sum of its proper divisors (24438104).

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

22216420 is a wasteful number, since it uses less digits than its factorization.

22216420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1110830 (or 1110828 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 22216420 is about 4713.4297491317. The cubic root of 22216420 is about 281.1197507186.

Adding to 22216420 its reverse (2461222), we get a palindrome (24677642).

The spelling of 22216420 in words is "twenty-two million, two hundred sixteen thousand, four hundred twenty".