206134640 has 20 divisors (see below), whose sum is σ = 479263224. Its totient is φ = 82453824.

The previous prime is 206134633. The next prime is 206134661. The reversal of 206134640 is 46431602.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

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, 1288262 + ... + 1288421.

Almost surely, 2^206134640 is an apocalyptic number.

206134640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206134640 is an abundant number, since it is smaller than the sum of its proper divisors (273128584).

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

206134640 is a wasteful number, since it uses less digits than its factorization.

206134640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2576696 (or 2576690 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 206134640 is about 14357.3897349066. The cubic root of 206134640 is about 590.7226995700.

The spelling of 206134640 in words is "two hundred six million, one hundred thirty-four thousand, six hundred forty".