220404493 has 2 divisors, whose sum is σ = 220404494. Its totient is φ = 220404492.

The previous prime is 220404433. The next prime is 220404497. The reversal of 220404493 is 394404022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172213129 + 48191364 = 13123^2 + 6942^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220404493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220404497) 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 as a sum of consecutive naturals, namely, 110202246 + 110202247.

It is an arithmetic number, because the mean of its divisors is an integer number (110202247).

Almost surely, 2^220404493 is an apocalyptic number.

It is an amenable number.

220404493 is a deficient number, since it is larger than the sum of its proper divisors (1).

220404493 is an equidigital number, since it uses as much as digits as its factorization.

220404493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 220404493 is about 14846.0261686419. The cubic root of 220404493 is about 604.0508240860.

The spelling of 220404493 in words is "two hundred twenty million, four hundred four thousand, four hundred ninety-three".