21804180220 has 48 divisors (see below), whose sum is σ = 46163124000. Its totient is φ = 8650540800.

The previous prime is 21804180191. The next prime is 21804180247. The reversal of 21804180220 is 2208140812.

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 15 ways as a sum of consecutive naturals, for example, 2197270 + ... + 2207170.

It is an arithmetic number, because the mean of its divisors is an integer number (961731750).

Almost surely, 2^21804180220 is an apocalyptic number.

21804180220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21804180220 is an abundant number, since it is smaller than the sum of its proper divisors (24358943780).

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

21804180220 is a wasteful number, since it uses less digits than its factorization.

21804180220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10798 (or 10796 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 28.

The spelling of 21804180220 in words is "twenty-one billion, eight hundred four million, one hundred eighty thousand, two hundred twenty".