22001305 has 4 divisors (see below), whose sum is σ = 26401572. Its totient is φ = 17601040.

The previous prime is 22001303. The next prime is 22001321. The reversal of 22001305 is 50310022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16679056 + 5322249 = 4084^2 + 2307^2 .

It is not a de Polignac number, because 22001305 - 2¹ = 22001303 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22001303) 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, 2200126 + ... + 2200135.

It is an arithmetic number, because the mean of its divisors is an integer number (6600393).

Almost surely, 2^22001305 is an apocalyptic number.

It is an amenable number.

22001305 is a deficient number, since it is larger than the sum of its proper divisors (4400267).

22001305 is an equidigital number, since it uses as much as digits as its factorization.

22001305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4400266.

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 22001305 is about 4690.5548712279. The cubic root of 22001305 is about 280.2094733519.

Adding to 22001305 its reverse (50310022), we get a palindrome (72311327).

The spelling of 22001305 in words is "twenty-two million, one thousand, three hundred five".