22009856 has 48 divisors (see below), whose sum is σ = 48058920. Its totient is φ = 9994240.

The previous prime is 22009853. The next prime is 22009859. The reversal of 22009856 is 65890022.

It is an interprime number because it is at equal distance from previous prime (22009853) and next prime (22009859).

It is a super-2 number, since 2×22009856² = 968867522281472, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22009853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22040 + ... + 23016.

Almost surely, 2^22009856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22009856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24029460).

22009856 is an abundant number, since it is smaller than the sum of its proper divisors (26049064).

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

22009856 is an equidigital number, since it uses as much as digits as its factorization.

22009856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010 (or 990 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 22009856 is about 4691.4662953068. The cubic root of 22009856 is about 280.2457706058.

Adding to 22009856 its reverse (65890022), we get a palindrome (87899878).

The spelling of 22009856 in words is "twenty-two million, nine thousand, eight hundred fifty-six".