220385685 has 32 divisors (see below), whose sum is σ = 380717568. Its totient is φ = 108218880.

The previous prime is 220385681. The next prime is 220385687. The reversal of 220385685 is 586583022.

It is not a de Polignac number, because 220385685 - 2² = 220385681 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220385681) 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 31 ways as a sum of consecutive naturals, for example, 89065 + ... + 91505.

It is an arithmetic number, because the mean of its divisors is an integer number (11897424).

Almost surely, 2^220385685 is an apocalyptic number.

It is an amenable number.

220385685 is a deficient number, since it is larger than the sum of its proper divisors (160331883).

220385685 is a wasteful number, since it uses less digits than its factorization.

220385685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2925.

The product of its (nonzero) digits is 115200, while the sum is 39.

The square root of 220385685 is about 14845.3927196285. The cubic root of 220385685 is about 604.0336415702.

The spelling of 220385685 in words is "two hundred twenty million, three hundred eighty-five thousand, six hundred eighty-five".