1820505930 has 16 divisors (see below), whose sum is σ = 4369214304. Its totient is φ = 485468240.

The previous prime is 1820505893. The next prime is 1820505997. The reversal of 1820505930 is 395050281.

It is a junction number, because it is equal to n+sod(n) for n = 1820505891 and 1820505900.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30341736 + ... + 30341795.

It is an arithmetic number, because the mean of its divisors is an integer number (273075894).

Almost surely, 2^1820505930 is an apocalyptic number.

1820505930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1820505930 is an abundant number, since it is smaller than the sum of its proper divisors (2548708374).

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

1820505930 is a wasteful number, since it uses less digits than its factorization.

1820505930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60683541.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 1820505930 is about 42667.3871944369. The cubic root of 1820505930 is about 1221.0422719915.

The spelling of 1820505930 in words is "one billion, eight hundred twenty million, five hundred five thousand, nine hundred thirty".