220238257 has 4 divisors (see below), whose sum is σ = 220282660. Its totient is φ = 220193856.

The previous prime is 220238251. The next prime is 220238269. The reversal of 220238257 is 752832022.

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

It can be written as a sum of positive squares in 2 ways, for example, as 197571136 + 22667121 = 14056^2 + 4761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220238257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220238251) 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 in 3 ways as a sum of consecutive naturals, for example, 13668 + ... + 25045.

It is an arithmetic number, because the mean of its divisors is an integer number (55070665).

Almost surely, 2^220238257 is an apocalyptic number.

It is an amenable number.

220238257 is a deficient number, since it is larger than the sum of its proper divisors (44403).

220238257 is an equidigital number, since it uses as much as digits as its factorization.

220238257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44402.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 220238257 is about 14840.4264426599. The cubic root of 220238257 is about 603.8989211803.

The spelling of 220238257 in words is "two hundred twenty million, two hundred thirty-eight thousand, two hundred fifty-seven".