220840247 has 2 divisors, whose sum is σ = 220840248. Its totient is φ = 220840246.

The previous prime is 220840231. The next prime is 220840259. The reversal of 220840247 is 742048022.

220840247 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 220840247 - 2⁴ = 220840231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220840297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110420123 + 110420124.

It is an arithmetic number, because the mean of its divisors is an integer number (110420124).

Almost surely, 2^220840247 is an apocalyptic number.

220840247 is a deficient number, since it is larger than the sum of its proper divisors (1).

220840247 is an equidigital number, since it uses as much as digits as its factorization.

220840247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7168, while the sum is 29.

The square root of 220840247 is about 14860.6947011235. The cubic root of 220840247 is about 604.4486446014.

Adding to 220840247 its reverse (742048022), we get a palindrome (962888269).

The spelling of 220840247 in words is "two hundred twenty million, eight hundred forty thousand, two hundred forty-seven".