20258161 has 32 divisors (see below), whose sum is σ = 27141120. Its totient is φ = 14644800.

The previous prime is 20258149. The next prime is 20258171. The reversal of 20258161 is 16185202.

20258161 = T₇₈ + T₇₉ + ... + T₄₉₅.

It is a cyclic number.

It is not a de Polignac number, because 20258161 - 2¹³ = 20249969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20258111) 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 in 31 ways as a sum of consecutive naturals, for example, 89130 + ... + 89356.

It is an arithmetic number, because the mean of its divisors is an integer number (848160).

Almost surely, 2^20258161 is an apocalyptic number.

It is an amenable number.

20258161 is a deficient number, since it is larger than the sum of its proper divisors (6882959).

20258161 is a wasteful number, since it uses less digits than its factorization.

20258161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 20258161 is about 4500.9066864355. The cubic root of 20258161 is about 272.6047001086.

The spelling of 20258161 in words is "twenty million, two hundred fifty-eight thousand, one hundred sixty-one".