204715540 has 12 divisors (see below), whose sum is σ = 429902676. Its totient is φ = 81886208.

The previous prime is 204715523. The next prime is 204715541. The reversal of 204715540 is 45517402.

It can be written as a sum of positive squares in 2 ways, for example, as 64577296 + 140138244 = 8036^2 + 11838^2 .

It is a junction number, because it is equal to n+sod(n) for n = 204715499 and 204715508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204715541) 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 3 ways as a sum of consecutive naturals, for example, 5117869 + ... + 5117908.

It is an arithmetic number, because the mean of its divisors is an integer number (35825223).

Almost surely, 2^204715540 is an apocalyptic number.

204715540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204715540 is an abundant number, since it is smaller than the sum of its proper divisors (225187136).

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

204715540 is a wasteful number, since it uses less digits than its factorization.

204715540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10235786 (or 10235784 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 204715540 is about 14307.8838407362. The cubic root of 204715540 is about 589.3639991357.

The spelling of 204715540 in words is "two hundred four million, seven hundred fifteen thousand, five hundred forty".