20223257 has 2 divisors, whose sum is σ = 20223258. Its totient is φ = 20223256.

The previous prime is 20223221. The next prime is 20223283. The reversal of 20223257 is 75232202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11485321 + 8737936 = 3389^2 + 2956^2 .

It is a cyclic number.

It is not a de Polignac number, because 20223257 - 2⁶ = 20223193 is a prime.

It is not a weakly prime, because it can be changed into another prime (20223457) 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, 10111628 + 10111629.

It is an arithmetic number, because the mean of its divisors is an integer number (10111629).

Almost surely, 2^20223257 is an apocalyptic number.

It is an amenable number.

20223257 is a deficient number, since it is larger than the sum of its proper divisors (1).

20223257 is an equidigital number, since it uses as much as digits as its factorization.

20223257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 23.

The square root of 20223257 is about 4497.0275738536. The cubic root of 20223257 is about 272.4480477791.

Adding to 20223257 its reverse (75232202), we get a palindrome (95455459).

The spelling of 20223257 in words is "twenty million, two hundred twenty-three thousand, two hundred fifty-seven".