20181820020 has 24 divisors (see below), whose sum is σ = 56509096224. Its totient is φ = 5381818656.

The previous prime is 20181819991. The next prime is 20181820081. The reversal of 20181820020 is 2002818102.

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 7 ways as a sum of consecutive naturals, for example, 168181774 + ... + 168181893.

It is an arithmetic number, because the mean of its divisors is an integer number (2354545676).

Almost surely, 2^20181820020 is an apocalyptic number.

20181820020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20181820020 is an abundant number, since it is smaller than the sum of its proper divisors (36327276204).

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

20181820020 is a wasteful number, since it uses less digits than its factorization.

20181820020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336363679 (or 336363677 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The spelling of 20181820020 in words is "twenty billion, one hundred eighty-one million, eight hundred twenty thousand, twenty".