205605156 has 48 divisors (see below), whose sum is σ = 506338560. Its totient is φ = 64755360.

The previous prime is 205605139. The next prime is 205605161. The reversal of 205605156 is 651506502.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105511 + ... + 107441.

It is an arithmetic number, because the mean of its divisors is an integer number (10548720).

Almost surely, 2^205605156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 205605156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253169280).

205605156 is an abundant number, since it is smaller than the sum of its proper divisors (300733404).

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

205605156 is a wasteful number, since it uses less digits than its factorization.

205605156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2424 (or 2422 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 205605156 is about 14338.9384544324. The cubic root of 205605156 is about 590.2164828489.

It can be divided in two parts, 205605 and 156, that added together give a triangular number (205761 = T₆₄₁).

The spelling of 205605156 in words is "two hundred five million, six hundred five thousand, one hundred fifty-six".