22005451 has 4 divisors (see below), whose sum is σ = 23698192. Its totient is φ = 20312712.

The previous prime is 22005449. The next prime is 22005499. The reversal of 22005451 is 15450022.

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

It is a cyclic number.

It is not a de Polignac number, because 22005451 - 2¹ = 22005449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22003451) 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, 846351 + ... + 846376.

It is an arithmetic number, because the mean of its divisors is an integer number (5924548).

Almost surely, 2^22005451 is an apocalyptic number.

22005451 is a deficient number, since it is larger than the sum of its proper divisors (1692741).

22005451 is a wasteful number, since it uses less digits than its factorization.

22005451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1692740.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 22005451 is about 4690.9968023865. The cubic root of 22005451 is about 280.2270734520.

Adding to 22005451 its reverse (15450022), we get a palindrome (37455473).

The spelling of 22005451 in words is "twenty-two million, five thousand, four hundred fifty-one".