220857893 has 2 divisors, whose sum is σ = 220857894. Its totient is φ = 220857892.

The previous prime is 220857887. The next prime is 220857911. The reversal of 220857893 is 398758022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 217179169 + 3678724 = 14737^2 + 1918^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220857893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220857803) by changing a digit.

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 as a sum of consecutive naturals, namely, 110428946 + 110428947.

It is an arithmetic number, because the mean of its divisors is an integer number (110428947).

Almost surely, 2^220857893 is an apocalyptic number.

It is an amenable number.

220857893 is a deficient number, since it is larger than the sum of its proper divisors (1).

220857893 is an equidigital number, since it uses as much as digits as its factorization.

220857893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 220857893 is about 14861.2884030961. The cubic root of 220857893 is about 604.4647434434.

The spelling of 220857893 in words is "two hundred twenty million, eight hundred fifty-seven thousand, eight hundred ninety-three".