206525640 has 64 divisors (see below), whose sum is σ = 621043200. Its totient is φ = 54943232.

The previous prime is 206525623. The next prime is 206525647. The reversal of 206525640 is 46525602.

It is a Cunningham number, because it is equal to 14371²-1.

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 = 206525598 and 206525607.

It is not an unprimeable number, because it can be changed into a prime (206525647) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 55684 + ... + 59276.

It is an arithmetic number, because the mean of its divisors is an integer number (9703800).

Almost surely, 2^206525640 is an apocalyptic number.

206525640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206525640 is an abundant number, since it is smaller than the sum of its proper divisors (414517560).

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

206525640 is a wasteful number, since it uses less digits than its factorization.

206525640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4086 (or 4082 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 206525640 is about 14370.9999652077. Note that the first 4 decimals coincide. The cubic root of 206525640 is about 591.0959615822.

The spelling of 206525640 in words is "two hundred six million, five hundred twenty-five thousand, six hundred forty".