206510380 has 12 divisors (see below), whose sum is σ = 433671840. Its totient is φ = 82604144.

The previous prime is 206510351. The next prime is 206510383. The reversal of 206510380 is 83015602.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (206510383) 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 3 ways as a sum of consecutive naturals, for example, 5162740 + ... + 5162779.

It is an arithmetic number, because the mean of its divisors is an integer number (36139320).

Almost surely, 2^206510380 is an apocalyptic number.

206510380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206510380 is an abundant number, since it is smaller than the sum of its proper divisors (227161460).

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

206510380 is a wasteful number, since it uses less digits than its factorization.

206510380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10325528 (or 10325526 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 206510380 is about 14370.4690250527. The cubic root of 206510380 is about 591.0814027014.

Adding to 206510380 its reverse (83015602), we get a palindrome (289525982).

The spelling of 206510380 in words is "two hundred six million, five hundred ten thousand, three hundred eighty".