181920102020 has 24 divisors (see below), whose sum is σ = 382320161664. Its totient is φ = 72713193696.

The previous prime is 181920102017. The next prime is 181920102031. The reversal of 181920102020 is 20201029181.

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, 3400742 + ... + 3453821.

It is an arithmetic number, because the mean of its divisors is an integer number (15930006736).

Almost surely, 2^181920102020 is an apocalyptic number.

181920102020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181920102020 is an abundant number, since it is smaller than the sum of its proper divisors (200400059644).

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

181920102020 is a wasteful number, since it uses less digits than its factorization.

181920102020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6855899 (or 6855897 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 26.

The spelling of 181920102020 in words is "one hundred eighty-one billion, nine hundred twenty million, one hundred two thousand, twenty".