204020520 has 96 divisors (see below), whose sum is σ = 672809760. Its totient is φ = 49456000.

The previous prime is 204020501. The next prime is 204020533. The reversal of 204020520 is 25020402.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 204020520.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 7495 + ... + 21545.

It is an arithmetic number, because the mean of its divisors is an integer number (7008435).

Almost surely, 2^204020520 is an apocalyptic number.

204020520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204020520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (336404880).

204020520 is an abundant number, since it is smaller than the sum of its proper divisors (468789240).

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

204020520 is a wasteful number, since it uses less digits than its factorization.

204020520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14087 (or 14072 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 15.

The square root of 204020520 is about 14283.5751827055. The cubic root of 204020520 is about 588.6962690044.

Adding to 204020520 its reverse (25020402), we get a palindrome (229040922).

The spelling of 204020520 in words is "two hundred four million, twenty thousand, five hundred twenty".