220001844 has 24 divisors (see below), whose sum is σ = 518138208. Its totient is φ = 72648160.

The previous prime is 220001843. The next prime is 220001849. The reversal of 220001844 is 448100022.

It is a super-2 number, since 2×220001844² = 96801622726800672, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 220001844.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220001843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84387 + ... + 86954.

It is an arithmetic number, because the mean of its divisors is an integer number (21589092).

Almost surely, 2^220001844 is an apocalyptic number.

It is an amenable number.

220001844 is an abundant number, since it is smaller than the sum of its proper divisors (298136364).

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

220001844 is a wasteful number, since it uses less digits than its factorization.

220001844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171455 (or 171453 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 220001844 is about 14832.4591352884. The cubic root of 220001844 is about 603.6827603234.

Adding to 220001844 its reverse (448100022), we get a palindrome (668101866).

The spelling of 220001844 in words is "two hundred twenty million, one thousand, eight hundred forty-four".