220001856 has 28 divisors (see below), whose sum is σ = 582088752. Its totient is φ = 73333888.

The previous prime is 220001849. The next prime is 220001857. The reversal of 220001856 is 658100022.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (220001857) 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, 572730 + ... + 573113.

It is an arithmetic number, because the mean of its divisors is an integer number (20788884).

Almost surely, 2^220001856 is an apocalyptic number.

It is an amenable number.

220001856 is an abundant number, since it is smaller than the sum of its proper divisors (362086896).

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

220001856 is a wasteful number, since it uses less digits than its factorization.

220001856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1145858 (or 1145848 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 220001856 is about 14832.4595398066. The cubic root of 220001856 is about 603.6827712993.

Adding to 220001856 its reverse (658100022), we get a palindrome (878101878).

The spelling of 220001856 in words is "two hundred twenty million, one thousand, eight hundred fifty-six".