22102805 has 16 divisors (see below), whose sum is σ = 28194480. Its totient is φ = 16576512.

The previous prime is 22102799. The next prime is 22102837. The reversal of 22102805 is 50820122.

It can be written as a sum of positive squares in 8 ways, for example, as 209764 + 21893041 = 458^2 + 4679^2 .

It is a cyclic number.

It is not a de Polignac number, because 22102805 - 2¹⁶ = 22037269 is a prime.

22102805 is a modest number, since divided by 2805 gives 2210 as remainder.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38561 + ... + 39129.

It is an arithmetic number, because the mean of its divisors is an integer number (1762155).

Almost surely, 2^22102805 is an apocalyptic number.

It is an amenable number.

22102805 is a deficient number, since it is larger than the sum of its proper divisors (6091675).

22102805 is a wasteful number, since it uses less digits than its factorization.

22102805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1048.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 22102805 is about 4701.3620366868. The cubic root of 22102805 is about 280.6397150532.

Adding to 22102805 its reverse (50820122), we get a palindrome (72922927).

The spelling of 22102805 in words is "twenty-two million, one hundred two thousand, eight hundred five".