20817222 has 8 divisors (see below), whose sum is σ = 41634456. Its totient is φ = 6939072.

The previous prime is 20817221. The next prime is 20817229. The reversal of 20817222 is 22271802.

It is a happy number.

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

20817222 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 20817192 and 20817201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20817221) 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, 1734763 + ... + 1734774.

It is an arithmetic number, because the mean of its divisors is an integer number (5204307).

Almost surely, 2^20817222 is an apocalyptic number.

20817222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20817222 is a wasteful number, since it uses less digits than its factorization.

20817222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3469542.

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 20817222 is about 4562.5893963845. The cubic root of 20817222 is about 275.0896545145.

The spelling of 20817222 in words is "twenty million, eight hundred seventeen thousand, two hundred twenty-two".