204001520 has 20 divisors (see below), whose sum is σ = 474303720. Its totient is φ = 81600576.

The previous prime is 204001471. The next prime is 204001529. The reversal of 204001520 is 25100402.

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

It is a junction number, because it is equal to n+sod(n) for n = 204001495 and 204001504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204001529) 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, 1274930 + ... + 1275089.

It is an arithmetic number, because the mean of its divisors is an integer number (23715186).

Almost surely, 2^204001520 is an apocalyptic number.

204001520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204001520 is an abundant number, since it is smaller than the sum of its proper divisors (270302200).

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

204001520 is a wasteful number, since it uses less digits than its factorization.

204001520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2550032 (or 2550026 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 204001520 is about 14282.9100676298. The cubic root of 204001520 is about 588.6779937571.

Adding to 204001520 its reverse (25100402), we get a palindrome (229101922).

The spelling of 204001520 in words is "two hundred four million, one thousand, five hundred twenty".