22005457 has 4 divisors (see below), whose sum is σ = 22962240. Its totient is φ = 21048676.

The previous prime is 22005449. The next prime is 22005499. The reversal of 22005457 is 75450022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22005457 - 2³ = 22005449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22008457) 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, 478357 + ... + 478402.

It is an arithmetic number, because the mean of its divisors is an integer number (5740560).

Almost surely, 2^22005457 is an apocalyptic number.

It is an amenable number.

22005457 is a deficient number, since it is larger than the sum of its proper divisors (956783).

22005457 is an equidigital number, since it uses as much as digits as its factorization.

22005457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956782.

The product of its (nonzero) digits is 2800, while the sum is 25.

The square root of 22005457 is about 4690.9974419093. The cubic root of 22005457 is about 280.2270989209.

Adding to 22005457 its reverse (75450022), we get a palindrome (97455479).

The spelling of 22005457 in words is "twenty-two million, five thousand, four hundred fifty-seven".