204721725 has 24 divisors (see below), whose sum is σ = 364511392. Its totient is φ = 100785600.

The previous prime is 204721721. The next prime is 204721739. The reversal of 204721725 is 527127402.

It is not a de Polignac number, because 204721725 - 2² = 204721721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204721692 and 204721701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204721721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 104011 + ... + 105960.

Almost surely, 2^204721725 is an apocalyptic number.

204721725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

204721725 is a deficient number, since it is larger than the sum of its proper divisors (159789667).

204721725 is a wasteful number, since it uses less digits than its factorization.

204721725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209997 (or 209992 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 30.

The square root of 204721725 is about 14308.0999786834. The cubic root of 204721725 is about 589.3699344930.

The spelling of 204721725 in words is "two hundred four million, seven hundred twenty-one thousand, seven hundred twenty-five".