220343985 has 12 divisors (see below), whose sum is σ = 381929652. Its totient is φ = 117516768.

The previous prime is 220343971. The next prime is 220343999. The reversal of 220343985 is 589343022.

220343985 is a `hidden beast` number, since 220 + 343 + 98 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (220343971) and next prime (220343999).

It can be written as a sum of positive squares in 2 ways, for example, as 144288144 + 76055841 = 12012^2 + 8721^2 .

It is not a de Polignac number, because 220343985 - 2¹⁰ = 220342961 is a prime.

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 11 ways as a sum of consecutive naturals, for example, 2448222 + ... + 2448311.

It is an arithmetic number, because the mean of its divisors is an integer number (31827471).

Almost surely, 2^220343985 is an apocalyptic number.

It is an amenable number.

220343985 is a deficient number, since it is larger than the sum of its proper divisors (161585667).

220343985 is a wasteful number, since it uses less digits than its factorization.

220343985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4896544 (or 4896541 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 220343985 is about 14843.9881770365. The cubic root of 220343985 is about 603.9955420120.

The spelling of 220343985 in words is "two hundred twenty million, three hundred forty-three thousand, nine hundred eighty-five".