205956220 has 24 divisors (see below), whose sum is σ = 436971024. Its totient is φ = 81532416.

The previous prime is 205956203. The next prime is 205956221. The reversal of 205956220 is 22659502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205956221) 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 7 ways as a sum of consecutive naturals, for example, 51142 + ... + 55021.

It is an arithmetic number, because the mean of its divisors is an integer number (18207126).

Almost surely, 2^205956220 is an apocalyptic number.

205956220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205956220 is an abundant number, since it is smaller than the sum of its proper divisors (231014804).

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

205956220 is a wasteful number, since it uses less digits than its factorization.

205956220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106269 (or 106267 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 205956220 is about 14351.1748647977. The cubic root of 205956220 is about 590.5522168741.

The spelling of 205956220 in words is "two hundred five million, nine hundred fifty-six thousand, two hundred twenty".