22015845 has 12 divisors (see below), whose sum is σ = 38160876. Its totient is φ = 11741760.

The previous prime is 22015801. The next prime is 22015883. The reversal of 22015845 is 54851022.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2461761 + 19554084 = 1569^2 + 4422^2 .

It is not a de Polignac number, because 22015845 - 2⁷ = 22015717 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 244576 + ... + 244665.

It is an arithmetic number, because the mean of its divisors is an integer number (3180073).

Almost surely, 2^22015845 is an apocalyptic number.

It is an amenable number.

22015845 is a deficient number, since it is larger than the sum of its proper divisors (16145031).

22015845 is a wasteful number, since it uses less digits than its factorization.

22015845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489252 (or 489249 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 22015845 is about 4692.1045384774. The cubic root of 22015845 is about 280.2711870936.

Adding to 22015845 its reverse (54851022), we get a palindrome (76866867).

The spelling of 22015845 in words is "twenty-two million, fifteen thousand, eight hundred forty-five".