220785720 has 64 divisors (see below), whose sum is σ = 683735040. Its totient is φ = 56976000.

The previous prime is 220785701. The next prime is 220785731. The reversal of 220785720 is 27587022.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 25956 + ... + 33395.

It is an arithmetic number, because the mean of its divisors is an integer number (10683360).

Almost surely, 2^220785720 is an apocalyptic number.

220785720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220785720 is an abundant number, since it is smaller than the sum of its proper divisors (462949320).

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

220785720 is a wasteful number, since it uses less digits than its factorization.

220785720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59396 (or 59392 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 220785720 is about 14858.8599831885. The cubic root of 220785720 is about 604.3988929753.

The spelling of 220785720 in words is "two hundred twenty million, seven hundred eighty-five thousand, seven hundred twenty".