220666240 has 32 divisors (see below), whose sum is σ = 527531760. Its totient is φ = 88266240.

The previous prime is 220666213. The next prime is 220666241. The reversal of 220666240 is 42666022.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 220666199 and 220666208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220666241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171756 + ... + 173035.

Almost surely, 2^220666240 is an apocalyptic number.

220666240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220666240 is an abundant number, since it is smaller than the sum of its proper divisors (306865520).

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

220666240 is an equidigital number, since it uses as much as digits as its factorization.

220666240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344810 (or 344798 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 220666240 is about 14854.8389422437. The cubic root of 220666240 is about 604.2898481664.

The spelling of 220666240 in words is "two hundred twenty million, six hundred sixty-six thousand, two hundred forty".