221850020 has 24 divisors (see below), whose sum is σ = 532440384. Its totient is φ = 76062816.

The previous prime is 221849987. The next prime is 221850037. The reversal of 221850020 is 20058122.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 221849974 and 221850001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 792182 + ... + 792461.

It is an arithmetic number, because the mean of its divisors is an integer number (22185016).

Almost surely, 2^221850020 is an apocalyptic number.

221850020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221850020 is an abundant number, since it is smaller than the sum of its proper divisors (310590364).

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

221850020 is a wasteful number, since it uses less digits than its factorization.

221850020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1584659 (or 1584657 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 221850020 is about 14894.6305761506. The cubic root of 221850020 is about 605.3685071397.

The spelling of 221850020 in words is "two hundred twenty-one million, eight hundred fifty thousand, twenty".