22015530 has 64 divisors (see below), whose sum is σ = 59633280. Its totient is φ = 5778432.

The previous prime is 22015523. The next prime is 22015537. The reversal of 22015530 is 3551022.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (22015523) and next prime (22015537).

It is a super-2 number, since 2×22015530² = 969367122361800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22015537) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17482 + ... + 18698.

It is an arithmetic number, because the mean of its divisors is an integer number (931770).

Almost surely, 2^22015530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22015530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29816640).

22015530 is an abundant number, since it is smaller than the sum of its proper divisors (37617750).

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

22015530 is a wasteful number, since it uses less digits than its factorization.

22015530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1300 (or 1294 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 22015530 is about 4692.0709713303. The cubic root of 22015530 is about 280.2698503920.

Adding to 22015530 its reverse (3551022), we get a palindrome (25566552).

The spelling of 22015530 in words is "twenty-two million, fifteen thousand, five hundred thirty".