220857905 has 8 divisors (see below), whose sum is σ = 266188200. Its totient is φ = 175913856.

The previous prime is 220857893. The next prime is 220857911. The reversal of 220857905 is 509758022.

It can be written as a sum of positive squares in 4 ways, for example, as 54937744 + 165920161 = 7412^2 + 12881^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 220857905 - 2²⁰ = 219809329 is a prime.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 95300 + ... + 97589.

It is an arithmetic number, because the mean of its divisors is an integer number (33273525).

Almost surely, 2^220857905 is an apocalyptic number.

It is an amenable number.

220857905 is a deficient number, since it is larger than the sum of its proper divisors (45330295).

220857905 is a wasteful number, since it uses less digits than its factorization.

220857905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193123.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 220857905 is about 14861.2888068296. The cubic root of 220857905 is about 604.4647543910.

The spelling of 220857905 in words is "two hundred twenty million, eight hundred fifty-seven thousand, nine hundred five".