206555660 has 48 divisors (see below), whose sum is σ = 445671072. Its totient is φ = 80371200.

The previous prime is 206555659. The next prime is 206555677. The reversal of 206555660 is 66555602.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 206555660.

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, 396200 + ... + 396720.

It is an arithmetic number, because the mean of its divisors is an integer number (9284814).

Almost surely, 2^206555660 is an apocalyptic number.

206555660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 206555660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (222835536).

206555660 is an abundant number, since it is smaller than the sum of its proper divisors (239115412).

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

206555660 is a wasteful number, since it uses less digits than its factorization.

206555660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1034 (or 1032 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 35.

The square root of 206555660 is about 14372.0443918045. The cubic root of 206555660 is about 591.1246002234.

The spelling of 206555660 in words is "two hundred six million, five hundred fifty-five thousand, six hundred sixty".