22305618 has 40 divisors (see below), whose sum is σ = 50356812. Its totient is φ = 7379424.

The previous prime is 22305587. The next prime is 22305623. The reversal of 22305618 is 81650322.

It can be written as a sum of positive squares in 2 ways, for example, as 22155849 + 149769 = 4707^2 + 387^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 22305591 and 22305600.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 24996 + ... + 25872.

Almost surely, 2^22305618 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22305618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25178406).

22305618 is an abundant number, since it is smaller than the sum of its proper divisors (28051194).

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

22305618 is a wasteful number, since it uses less digits than its factorization.

22305618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1048 (or 1039 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 22305618 is about 4722.8823826134. The cubic root of 22305618 is about 281.4954763514.

The spelling of 22305618 in words is "twenty-two million, three hundred five thousand, six hundred eighteen".