206508540 has 72 divisors (see below), whose sum is σ = 672637392. Its totient is φ = 47201280.

The previous prime is 206508529. The next prime is 206508551. The reversal of 206508540 is 45805602.

It is an interprime number because it is at equal distance from previous prime (206508529) and next prime (206508551).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 206508498 and 206508507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32181 + ... + 38060.

It is an arithmetic number, because the mean of its divisors is an integer number (9342186).

Almost surely, 2^206508540 is an apocalyptic number.

206508540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206508540 is an abundant number, since it is smaller than the sum of its proper divisors (466128852).

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

206508540 is a wasteful number, since it uses less digits than its factorization.

206508540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70267 (or 70258 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 206508540 is about 14370.4050047311. The cubic root of 206508540 is about 591.0796471916.

The spelling of 206508540 in words is "two hundred six million, five hundred eight thousand, five hundred forty".