221066020 has 24 divisors (see below), whose sum is σ = 530558784. Its totient is φ = 75794016.

The previous prime is 221065997. The next prime is 221066029. The reversal of 221066020 is 20660122.

It is not an unprimeable number, because it can be changed into a prime (221066029) by changing a digit.

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, 789382 + ... + 789661.

It is an arithmetic number, because the mean of its divisors is an integer number (22106616).

Almost surely, 2^221066020 is an apocalyptic number.

221066020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221066020 is an abundant number, since it is smaller than the sum of its proper divisors (309492764).

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

221066020 is a wasteful number, since it uses less digits than its factorization.

221066020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1579059 (or 1579057 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 221066020 is about 14868.2890744026. The cubic root of 221066020 is about 604.6545577093.

The spelling of 221066020 in words is "two hundred twenty-one million, sixty-six thousand, twenty".