1820161320 has 32 divisors (see below), whose sum is σ = 5460484320. Its totient is φ = 485376320.

The previous prime is 1820161303. The next prime is 1820161349. The reversal of 1820161320 is 231610281.

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

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 7 ways as a sum of consecutive naturals, for example, 7583886 + ... + 7584125.

It is an arithmetic number, because the mean of its divisors is an integer number (170640135).

Almost surely, 2^1820161320 is an apocalyptic number.

1820161320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1820161320 is an abundant number, since it is smaller than the sum of its proper divisors (3640323000).

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

1820161320 is a wasteful number, since it uses less digits than its factorization.

1820161320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15168025 (or 15168021 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 1820161320 is about 42663.3486730707. The cubic root of 1820161320 is about 1220.9652219943.

The spelling of 1820161320 in words is "one billion, eight hundred twenty million, one hundred sixty-one thousand, three hundred twenty".