220857947 has 4 divisors (see below), whose sum is σ = 221192736. Its totient is φ = 220523160.

The previous prime is 220857911. The next prime is 220857977. The reversal of 220857947 is 749758022.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 220857947 - 2⁶ = 220857883 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220857898 and 220857907.

It is not an unprimeable number, because it can be changed into a prime (220857977) 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 3 ways as a sum of consecutive naturals, for example, 166403 + ... + 167724.

It is an arithmetic number, because the mean of its divisors is an integer number (55298184).

Almost surely, 2^220857947 is an apocalyptic number.

220857947 is a deficient number, since it is larger than the sum of its proper divisors (334789).

220857947 is an equidigital number, since it uses as much as digits as its factorization.

220857947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334788.

The product of its (nonzero) digits is 282240, while the sum is 44.

The square root of 220857947 is about 14861.2902198968. The cubic root of 220857947 is about 604.4647927075.

The spelling of 220857947 in words is "two hundred twenty million, eight hundred fifty-seven thousand, nine hundred forty-seven".