206115380 has 12 divisors (see below), whose sum is σ = 432842340. Its totient is φ = 82446144.

The previous prime is 206115359. The next prime is 206115391. The reversal of 206115380 is 83511602.

It can be written as a sum of positive squares in 2 ways, for example, as 111598096 + 94517284 = 10564^2 + 9722^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5152865 + ... + 5152904.

It is an arithmetic number, because the mean of its divisors is an integer number (36070195).

Almost surely, 2^206115380 is an apocalyptic number.

206115380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206115380 is an abundant number, since it is smaller than the sum of its proper divisors (226726960).

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

206115380 is a wasteful number, since it uses less digits than its factorization.

206115380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10305778 (or 10305776 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 206115380 is about 14356.7189845034. The cubic root of 206115380 is about 590.7043011201.

Adding to 206115380 its reverse (83511602), we get a palindrome (289626982).

The spelling of 206115380 in words is "two hundred six million, one hundred fifteen thousand, three hundred eighty".