1820219120 has 20 divisors (see below), whose sum is σ = 4232009640. Its totient is φ = 728087616.

The previous prime is 1820219117. The next prime is 1820219147. The reversal of 1820219120 is 219120281.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 1820219120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11376290 + ... + 11376449.

It is an arithmetic number, because the mean of its divisors is an integer number (211600482).

Almost surely, 2^1820219120 is an apocalyptic number.

1820219120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1820219120 is an abundant number, since it is smaller than the sum of its proper divisors (2411790520).

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

1820219120 is a wasteful number, since it uses less digits than its factorization.

1820219120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22752752 (or 22752746 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 1820219120 is about 42664.0260641210. The cubic root of 1820219120 is about 1220.9781459482.

The spelling of 1820219120 in words is "one billion, eight hundred twenty million, two hundred nineteen thousand, one hundred twenty".