206840909280 has 48 divisors (see below), whose sum is σ = 651548865744. Its totient is φ = 55157575680.

The previous prime is 206840909267. The next prime is 206840909281. The reversal of 206840909280 is 82909048602.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206840909281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215458801 + ... + 215459760.

It is an arithmetic number, because the mean of its divisors is an integer number (13573934703).

Almost surely, 2^206840909280 is an apocalyptic number.

206840909280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206840909280 is an abundant number, since it is smaller than the sum of its proper divisors (444707956464).

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

206840909280 is a wasteful number, since it uses less digits than its factorization.

206840909280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430918579 (or 430918571 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 48.

The spelling of 206840909280 in words is "two hundred six billion, eight hundred forty million, nine hundred nine thousand, two hundred eighty".