22505810 has 8 divisors (see below), whose sum is σ = 40510476. Its totient is φ = 9002320.

The previous prime is 22505801. The next prime is 22505831. The reversal of 22505810 is 1850522.

It can be written as a sum of positive squares in 2 ways, for example, as 20620681 + 1885129 = 4541^2 + 1373^2 .

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

It is a super-2 number, since 2×22505810² = 1013022967512200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1125281 + ... + 1125300.

Almost surely, 2^22505810 is an apocalyptic number.

22505810 is a deficient number, since it is larger than the sum of its proper divisors (18004666).

22505810 is a wasteful number, since it uses less digits than its factorization.

22505810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2250588.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 22505810 is about 4744.0288784956. The cubic root of 22505810 is about 282.3351062145.

The spelling of 22505810 in words is "twenty-two million, five hundred five thousand, eight hundred ten".