1818201920020 has 48 divisors (see below), whose sum is σ = 3822607086480. Its totient is φ = 726446403584.

The previous prime is 1818201920011. The next prime is 1818201920047. The reversal of 1818201920020 is 200291028181.

It can be written as a sum of positive squares in 8 ways, for example, as 550510577296 + 1267691342724 = 741964^2 + 1125918^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65367876 + ... + 65395684.

It is an arithmetic number, because the mean of its divisors is an integer number (79637647635).

Almost surely, 2^{1818201920020} is an apocalyptic number.

1818201920020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1818201920020 is an abundant number, since it is smaller than the sum of its proper divisors (2004405166460).

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

1818201920020 is a wasteful number, since it uses less digits than its factorization.

1818201920020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31452 (or 31450 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 34.

The spelling of 1818201920020 in words is "one trillion, eight hundred eighteen billion, two hundred one million, nine hundred twenty thousand, twenty".