20355258 has 32 divisors (see below), whose sum is σ = 50757120. Its totient is φ = 5286960.

The previous prime is 20355241. The next prime is 20355271. The reversal of 20355258 is 85255302.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 21568 + ... + 22491.

It is an arithmetic number, because the mean of its divisors is an integer number (1586160).

Almost surely, 2^20355258 is an apocalyptic number.

20355258 is an abundant number, since it is smaller than the sum of its proper divisors (30401862).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20355258 is a wasteful number, since it uses less digits than its factorization.

20355258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44082.

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 20355258 is about 4511.6801748351. The cubic root of 20355258 is about 273.0395359290.

The spelling of 20355258 in words is "twenty million, three hundred fifty-five thousand, two hundred fifty-eight".