22003855 has 4 divisors (see below), whose sum is σ = 26404632. Its totient is φ = 17603080.

The previous prime is 22003853. The next prime is 22003903. The reversal of 22003855 is 55830022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55830022 = 2 ⋅27915011.

It is not a de Polignac number, because 22003855 - 2¹ = 22003853 is a prime.

It is a super-2 number, since 2×22003855² = 968339269722050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22003853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2200381 + ... + 2200390.

It is an arithmetic number, because the mean of its divisors is an integer number (6601158).

Almost surely, 2^22003855 is an apocalyptic number.

22003855 is a deficient number, since it is larger than the sum of its proper divisors (4400777).

22003855 is an equidigital number, since it uses as much as digits as its factorization.

22003855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4400776.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 22003855 is about 4690.8266862036. The cubic root of 22003855 is about 280.2202985667.

Adding to 22003855 its reverse (55830022), we get a palindrome (77833877).

The spelling of 22003855 in words is "twenty-two million, three thousand, eight hundred fifty-five".