18402220020 has 24 divisors (see below), whose sum is σ = 51526216224. Its totient is φ = 4907258656.

The previous prime is 18402220007. The next prime is 18402220021. The reversal of 18402220020 is 2002220481.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18402220021) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 153351774 + ... + 153351893.

It is an arithmetic number, because the mean of its divisors is an integer number (2146925676).

Almost surely, 2^18402220020 is an apocalyptic number.

18402220020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18402220020 is an abundant number, since it is smaller than the sum of its proper divisors (33123996204).

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

18402220020 is a wasteful number, since it uses less digits than its factorization.

18402220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306703679 (or 306703677 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The spelling of 18402220020 in words is "eighteen billion, four hundred two million, two hundred twenty thousand, twenty".