2218445820 has 60 divisors (see below), whose sum is σ = 6959351784. Its totient is φ = 591585120.

The previous prime is 2218445819. The next prime is 2218445849. The reversal of 2218445820 is 285448122.

2218445820 is a `hidden beast` number, since 2 + 2 + 184 + 458 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 683086 + ... + 686325.

Almost surely, 2^2218445820 is an apocalyptic number.

2218445820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2218445820 is an abundant number, since it is smaller than the sum of its proper divisors (4740905964).

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

2218445820 is a wasteful number, since it uses less digits than its factorization.

2218445820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1369432 (or 1369421 counting only the distinct ones).

The product of its (nonzero) digits is 40960, while the sum is 36.

The square root of 2218445820 is about 47100.3802532421. The cubic root of 2218445820 is about 1304.2162555201.

The spelling of 2218445820 in words is "two billion, two hundred eighteen million, four hundred forty-five thousand, eight hundred twenty".