206531740 has 12 divisors (see below), whose sum is σ = 433716696. Its totient is φ = 82612688.

The previous prime is 206531723. The next prime is 206531749. The reversal of 206531740 is 47135602.

It is a junction number, because it is equal to n+sod(n) for n = 206531699 and 206531708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206531749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5163274 + ... + 5163313.

It is an arithmetic number, because the mean of its divisors is an integer number (36143058).

Almost surely, 2^206531740 is an apocalyptic number.

206531740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206531740 is an abundant number, since it is smaller than the sum of its proper divisors (227184956).

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

206531740 is a wasteful number, since it uses less digits than its factorization.

206531740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10326596 (or 10326594 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 206531740 is about 14371.2121966103. The cubic root of 206531740 is about 591.1017811177.

The spelling of 206531740 in words is "two hundred six million, five hundred thirty-one thousand, seven hundred forty".