220001823 has 12 divisors (see below), whose sum is σ = 328031808. Its totient is φ = 141936480.

The previous prime is 220001819. The next prime is 220001827. The reversal of 220001823 is 328100022.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (220001819) and next prime (220001827).

It is not a de Polignac number, because 220001823 - 2² = 220001819 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220001796 and 220001805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220001827) 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 11 ways as a sum of consecutive naturals, for example, 393990 + ... + 394547.

It is an arithmetic number, because the mean of its divisors is an integer number (27335984).

Almost surely, 2^220001823 is an apocalyptic number.

220001823 is a deficient number, since it is larger than the sum of its proper divisors (108029985).

220001823 is a wasteful number, since it uses less digits than its factorization.

220001823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788574 (or 788571 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 220001823 is about 14832.4584273815. The cubic root of 220001823 is about 603.6827411155.

Adding to 220001823 its reverse (328100022), we get a palindrome (548101845).

The spelling of 220001823 in words is "two hundred twenty million, one thousand, eight hundred twenty-three".