205270155 has 48 divisors (see below), whose sum is σ = 379439424. Its totient is φ = 102297600.

The previous prime is 205270141. The next prime is 205270157. The reversal of 205270155 is 551072502.

It is a happy number.

It is not a de Polignac number, because 205270155 - 2⁸ = 205269899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205270157) 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 47 ways as a sum of consecutive naturals, for example, 114627 + ... + 116403.

It is an arithmetic number, because the mean of its divisors is an integer number (7904988).

Almost surely, 2^205270155 is an apocalyptic number.

205270155 is a deficient number, since it is larger than the sum of its proper divisors (174169269).

205270155 is a wasteful number, since it uses less digits than its factorization.

205270155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1956 (or 1953 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The square root of 205270155 is about 14327.2521789770. The cubic root of 205270155 is about 589.8957538697.

The spelling of 205270155 in words is "two hundred five million, two hundred seventy thousand, one hundred fifty-five".