22320545 has 8 divisors (see below), whose sum is σ = 28845096. Its totient is φ = 16482816.

The previous prime is 22320503. The next prime is 22320559. The reversal of 22320545 is 54502322.

It can be written as a sum of positive squares in 4 ways, for example, as 1517824 + 20802721 = 1232^2 + 4561^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22320545 - 2¹² = 22316449 is a prime.

It is a super-3 number, since 3×22320545³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22320545.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171632 + ... + 171761.

It is an arithmetic number, because the mean of its divisors is an integer number (3605637).

Almost surely, 2^22320545 is an apocalyptic number.

It is an amenable number.

22320545 is a deficient number, since it is larger than the sum of its proper divisors (6524551).

22320545 is a wasteful number, since it uses less digits than its factorization.

22320545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343411.

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 22320545 is about 4724.4624032793. The cubic root of 22320545 is about 281.5582549455.

Adding to 22320545 its reverse (54502322), we get a palindrome (76822867).

The spelling of 22320545 in words is "twenty-two million, three hundred twenty thousand, five hundred forty-five".