22208660 has 12 divisors (see below), whose sum is σ = 46638228. Its totient is φ = 8883456.

The previous prime is 22208657. The next prime is 22208671. The reversal of 22208660 is 6680222.

It can be written as a sum of positive squares in 2 ways, for example, as 9449476 + 12759184 = 3074^2 + 3572^2 .

It is a congruent number.

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, 555197 + ... + 555236.

It is an arithmetic number, because the mean of its divisors is an integer number (3886519).

Almost surely, 2^22208660 is an apocalyptic number.

22208660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22208660 is an abundant number, since it is smaller than the sum of its proper divisors (24429568).

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

22208660 is a wasteful number, since it uses less digits than its factorization.

22208660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110442 (or 1110440 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 22208660 is about 4712.6064974704. The cubic root of 22208660 is about 281.0870160219.

Adding to 22208660 its reverse (6680222), we get a palindrome (28888882).

The spelling of 22208660 in words is "twenty-two million, two hundred eight thousand, six hundred sixty".