206503540 has 24 divisors (see below), whose sum is σ = 441010080. Its totient is φ = 81200928.

The previous prime is 206503537. The next prime is 206503547. The reversal of 206503540 is 45305602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206503547) 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, 86322 + ... + 88681.

It is an arithmetic number, because the mean of its divisors is an integer number (18375420).

Almost surely, 2^206503540 is an apocalyptic number.

206503540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206503540 is an abundant number, since it is smaller than the sum of its proper divisors (234506540).

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

206503540 is a wasteful number, since it uses less digits than its factorization.

206503540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175071 (or 175069 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 206503540 is about 14370.2310350252. The cubic root of 206503540 is about 591.0748767317.

The spelling of 206503540 in words is "two hundred six million, five hundred three thousand, five hundred forty".