22180406 has 4 divisors (see below), whose sum is σ = 33270612. Its totient is φ = 11090202.

The previous prime is 22180399. The next prime is 22180421. The reversal of 22180406 is 60408122.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5545100 + ... + 5545103.

It is an arithmetic number, because the mean of its divisors is an integer number (8317653).

Almost surely, 2^22180406 is an apocalyptic number.

22180406 is a deficient number, since it is larger than the sum of its proper divisors (11090206).

22180406 is a wasteful number, since it uses less digits than its factorization.

22180406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11090205.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 22180406 is about 4709.6078393004. The cubic root of 22180406 is about 280.9677652009.

Adding to 22180406 its reverse (60408122), we get a palindrome (82588528).

The spelling of 22180406 in words is "twenty-two million, one hundred eighty thousand, four hundred six".