204245351540 has 24 divisors (see below), whose sum is σ = 439376587272. Its totient is φ = 79705502720.

The previous prime is 204245351539. The next prime is 204245351549. The reversal of 204245351540 is 45153542402.

It can be written as a sum of positive squares in 4 ways, for example, as 12798849424 + 191446502116 = 113132^2 + 437546^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 204245351540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204245351549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124539029 + ... + 124540668.

It is an arithmetic number, because the mean of its divisors is an integer number (18307357803).

Almost surely, 2^204245351540 is an apocalyptic number.

204245351540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204245351540 is an abundant number, since it is smaller than the sum of its proper divisors (235131235732).

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

204245351540 is a wasteful number, since it uses less digits than its factorization.

204245351540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249079747 (or 249079745 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 35.

Adding to 204245351540 its reverse (45153542402), we get a palindrome (249398893942).

The spelling of 204245351540 in words is "two hundred four billion, two hundred forty-five million, three hundred fifty-one thousand, five hundred forty".