208118660 has 24 divisors (see below), whose sum is σ = 437909976. Its totient is φ = 83083520.

The previous prime is 208118657. The next prime is 208118663. The reversal of 208118660 is 66811802.

It is an interprime number because it is at equal distance from previous prime (208118657) and next prime (208118663).

It can be written as a sum of positive squares in 4 ways, for example, as 4656964 + 203461696 = 2158^2 + 14264^2 .

It is not an unprimeable number, because it can be changed into a prime (208118663) 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, 434 + ... + 20406.

It is an arithmetic number, because the mean of its divisors is an integer number (18246249).

Almost surely, 2^208118660 is an apocalyptic number.

208118660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

208118660 is an abundant number, since it is smaller than the sum of its proper divisors (229791316).

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

208118660 is a wasteful number, since it uses less digits than its factorization.

208118660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20503 (or 20501 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 208118660 is about 14426.3183106432. The cubic root of 208118660 is about 592.6118620653.

The spelling of 208118660 in words is "two hundred eight million, one hundred eighteen thousand, six hundred sixty".