20558233 has 2 divisors, whose sum is σ = 20558234. Its totient is φ = 20558232.

The previous prime is 20558221. The next prime is 20558243. The reversal of 20558233 is 33285502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18344089 + 2214144 = 4283^2 + 1488^2 .

It is a cyclic number.

It is not a de Polignac number, because 20558233 - 2⁹ = 20557721 is a prime.

It is not a weakly prime, because it can be changed into another prime (20558243) 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, 10279116 + 10279117.

It is an arithmetic number, because the mean of its divisors is an integer number (10279117).

Almost surely, 2^20558233 is an apocalyptic number.

It is an amenable number.

20558233 is a deficient number, since it is larger than the sum of its proper divisors (1).

20558233 is an equidigital number, since it uses as much as digits as its factorization.

20558233 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 20558233 is about 4534.1187677431. The cubic root of 20558233 is about 273.9440852391.

The spelling of 20558233 in words is "twenty million, five hundred fifty-eight thousand, two hundred thirty-three".