1820120930 has 8 divisors (see below), whose sum is σ = 3276217692. Its totient is φ = 728048368.

The previous prime is 1820120839. The next prime is 1820120957. The reversal of 1820120930 is 390210281.

It can be written as a sum of positive squares in 2 ways, for example, as 1772662609 + 47458321 = 42103^2 + 6889^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1820120930.

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, 91006037 + ... + 91006056.

Almost surely, 2^1820120930 is an apocalyptic number.

1820120930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1820120930 is a deficient number, since it is larger than the sum of its proper divisors (1456096762).

1820120930 is a wasteful number, since it uses less digits than its factorization.

1820120930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182012100.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 1820120930 is about 42662.8753133213. The cubic root of 1820120930 is about 1220.9561907160.

The spelling of 1820120930 in words is "one billion, eight hundred twenty million, one hundred twenty thousand, nine hundred thirty".