1820002020 has 48 divisors (see below), whose sum is σ = 5364219840. Its totient is φ = 459789696.

The previous prime is 1820002007. The next prime is 1820002021. The reversal of 1820002020 is 202000281.

1820002020 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (1820002021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 797107 + ... + 799386.

It is an arithmetic number, because the mean of its divisors is an integer number (111754580).

Almost surely, 2^1820002020 is an apocalyptic number.

1820002020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1820002020 is an abundant number, since it is smaller than the sum of its proper divisors (3544217820).

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

1820002020 is a wasteful number, since it uses less digits than its factorization.

1820002020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1596524 (or 1596522 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1820002020 is about 42661.4816901617. The cubic root of 1820002020 is about 1220.9296014457.

The spelling of 1820002020 in words is "one billion, eight hundred twenty million, two thousand, twenty".