220856385 has 16 divisors (see below), whose sum is σ = 361589184. Its totient is φ = 115050432.

The previous prime is 220856357. The next prime is 220856423. The reversal of 220856385 is 583658022.

It is a de Polignac number, because none of the positive numbers 2^k-220856385 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170562 + ... + 171851.

It is an arithmetic number, because the mean of its divisors is an integer number (22599324).

Almost surely, 2^220856385 is an apocalyptic number.

It is an amenable number.

220856385 is a deficient number, since it is larger than the sum of its proper divisors (140732799).

220856385 is a wasteful number, since it uses less digits than its factorization.

220856385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342464.

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

The square root of 220856385 is about 14861.2376671662. The cubic root of 220856385 is about 604.4633676947.

The spelling of 220856385 in words is "two hundred twenty million, eight hundred fifty-six thousand, three hundred eighty-five".