2220185640 has 32 divisors (see below), whose sum is σ = 6660557280. Its totient is φ = 592049472.

The previous prime is 2220185623. The next prime is 2220185641. The reversal of 2220185640 is 465810222.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 2220185598 and 2220185607.

It is not an unprimeable number, because it can be changed into a prime (2220185641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9250654 + ... + 9250893.

It is an arithmetic number, because the mean of its divisors is an integer number (208142415).

Almost surely, 2^2220185640 is an apocalyptic number.

2220185640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2220185640 is an abundant number, since it is smaller than the sum of its proper divisors (4440371640).

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

2220185640 is a wasteful number, since it uses less digits than its factorization.

2220185640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18501561 (or 18501557 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 2220185640 is about 47118.8459111638. The cubic root of 2220185640 is about 1304.5571110538.

Adding to 2220185640 its reverse (465810222), we get a palindrome (2685995862).

The spelling of 2220185640 in words is "two billion, two hundred twenty million, one hundred eighty-five thousand, six hundred forty".