1820001020 has 12 divisors (see below), whose sum is σ = 3822002184. Its totient is φ = 728000400.

The previous prime is 1820000999. The next prime is 1820001031. The reversal of 1820001020 is 201000281.

It is a junction number, because it is equal to n+sod(n) for n = 1820000986 and 1820001004.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 45500006 + ... + 45500045.

It is an arithmetic number, because the mean of its divisors is an integer number (318500182).

Almost surely, 2^1820001020 is an apocalyptic number.

1820001020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1820001020 is an abundant number, since it is smaller than the sum of its proper divisors (2002001164).

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

1820001020 is a wasteful number, since it uses less digits than its factorization.

1820001020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91000060 (or 91000058 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1820001020 is about 42661.4699699858. The cubic root of 1820001020 is about 1220.9293778324.

The spelling of 1820001020 in words is "one billion, eight hundred twenty million, one thousand, twenty".