220520257 has 2 divisors, whose sum is σ = 220520258. Its totient is φ = 220520256.

The previous prime is 220520239. The next prime is 220520273. The reversal of 220520257 is 752025022.

220520257 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 can be written as a sum of positive squares in only one way, i.e., 187388721 + 33131536 = 13689^2 + 5756^2 .

It is a cyclic number.

It is not a de Polignac number, because 220520257 - 2⁷ = 220520129 is a prime.

It is not a weakly prime, because it can be changed into another prime (220520857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110260128 + 110260129.

It is an arithmetic number, because the mean of its divisors is an integer number (110260129).

Almost surely, 2^220520257 is an apocalyptic number.

It is an amenable number.

220520257 is a deficient number, since it is larger than the sum of its proper divisors (1).

220520257 is an equidigital number, since it uses as much as digits as its factorization.

220520257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2800, while the sum is 25.

The square root of 220520257 is about 14849.9244779224. The cubic root of 220520257 is about 604.1565616468.

Adding to 220520257 its reverse (752025022), we get a palindrome (972545279).

The spelling of 220520257 in words is "two hundred twenty million, five hundred twenty thousand, two hundred fifty-seven".