22006477 has 4 divisors (see below), whose sum is σ = 22285120. Its totient is φ = 21727836.

The previous prime is 22006471. The next prime is 22006511. The reversal of 22006477 is 77460022.

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, and also an emirpimes, since its reverse is a distinct semiprime: 77460022 = 2 ⋅38730011.

It is a cyclic number.

It is not a de Polignac number, because 22006477 - 2⁷ = 22006349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22006471) 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, 139203 + ... + 139360.

It is an arithmetic number, because the mean of its divisors is an integer number (5571280).

Almost surely, 2^22006477 is an apocalyptic number.

It is an amenable number.

22006477 is a deficient number, since it is larger than the sum of its proper divisors (278643).

22006477 is an equidigital number, since it uses as much as digits as its factorization.

22006477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278642.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 22006477 is about 4691.1061595321. The cubic root of 22006477 is about 280.2314285625.

Adding to 22006477 its reverse (77460022), we get a palindrome (99466499).

The spelling of 22006477 in words is "twenty-two million, six thousand, four hundred seventy-seven".