206115660 has 72 divisors (see below), whose sum is σ = 628926480. Its totient is φ = 54638208.

The previous prime is 206115659. The next prime is 206115671. The reversal of 206115660 is 66511602.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27831 + ... + 34449.

It is an arithmetic number, because the mean of its divisors is an integer number (8735090).

Almost surely, 2^206115660 is an apocalyptic number.

206115660 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 206115660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (314463240).

206115660 is an abundant number, since it is smaller than the sum of its proper divisors (422810820).

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

206115660 is a wasteful number, since it uses less digits than its factorization.

206115660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6807 (or 6802 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 206115660 is about 14356.7287360318. The cubic root of 206115660 is about 590.7045686032.

The spelling of 206115660 in words is "two hundred six million, one hundred fifteen thousand, six hundred sixty".