1820257116 has 24 divisors (see below), whose sum is σ = 4497106320. Its totient is φ = 571060992.

The previous prime is 1820257111. The next prime is 1820257129. The reversal of 1820257116 is 6117520281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820257111) 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, 4461211 + ... + 4461618.

It is an arithmetic number, because the mean of its divisors is an integer number (187379430).

Almost surely, 2^1820257116 is an apocalyptic number.

It is an amenable number.

1820257116 is an abundant number, since it is smaller than the sum of its proper divisors (2676849204).

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

1820257116 is a wasteful number, since it uses less digits than its factorization.

1820257116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8922853 (or 8922851 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 33.

The square root of 1820257116 is about 42664.4713549811. The cubic root of 1820257116 is about 1220.9866416218.

Adding to 1820257116 its reverse (6117520281), we get a palindrome (7937777397).

The spelling of 1820257116 in words is "one billion, eight hundred twenty million, two hundred fifty-seven thousand, one hundred sixteen".