204010640 has 20 divisors (see below), whose sum is σ = 474324924. Its totient is φ = 81604224.

The previous prime is 204010633. The next prime is 204010643. The reversal of 204010640 is 46010402.

It can be written as a sum of positive squares in 2 ways, for example, as 60777616 + 143233024 = 7796^2 + 11968^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (204010643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1274987 + ... + 1275146.

Almost surely, 2^204010640 is an apocalyptic number.

204010640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204010640 is an abundant number, since it is smaller than the sum of its proper divisors (270314284).

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

204010640 is a wasteful number, since it uses less digits than its factorization.

204010640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2550146 (or 2550140 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 204010640 is about 14283.2293267314. The cubic root of 204010640 is about 588.6867660174.

The spelling of 204010640 in words is "two hundred four million, ten thousand, six hundred forty".