206353540 has 24 divisors (see below), whose sum is σ = 434127960. Its totient is φ = 82391808.

The previous prime is 206353523. The next prime is 206353541. The reversal of 206353540 is 45353602.

It can be written as a sum of positive squares in 4 ways, for example, as 1806336 + 204547204 = 1344^2 + 14302^2 .

It is a junction number, because it is equal to n+sod(n) for n = 206353499 and 206353508.

It is not an unprimeable number, because it can be changed into a prime (206353541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2314 + ... + 20446.

It is an arithmetic number, because the mean of its divisors is an integer number (18088665).

Almost surely, 2^206353540 is an apocalyptic number.

206353540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206353540 is an abundant number, since it is smaller than the sum of its proper divisors (227774420).

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

206353540 is a wasteful number, since it uses less digits than its factorization.

206353540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18711 (or 18709 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 28.

The square root of 206353540 is about 14365.0109641448. The cubic root of 206353540 is about 590.9317271156.

The spelling of 206353540 in words is "two hundred six million, three hundred fifty-three thousand, five hundred forty".