22001855 has 8 divisors (see below), whose sum is σ = 26428464. Its totient is φ = 17584000.

The previous prime is 22001851. The next prime is 22001857. The reversal of 22001855 is 55810022.

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

It is not a de Polignac number, because 22001855 - 2² = 22001851 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22001855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22001851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6455 + ... + 9255.

It is an arithmetic number, because the mean of its divisors is an integer number (3303558).

Almost surely, 2^22001855 is an apocalyptic number.

22001855 is a deficient number, since it is larger than the sum of its proper divisors (4426609).

22001855 is a wasteful number, since it uses less digits than its factorization.

22001855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4377.

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

The square root of 22001855 is about 4690.6134993197. The cubic root of 22001855 is about 280.2118082729.

Adding to 22001855 its reverse (55810022), we get a palindrome (77811877).

The spelling of 22001855 in words is "twenty-two million, one thousand, eight hundred fifty-five".