520221204 has 36 divisors (see below), whose sum is σ = 1363709984. Its totient is φ = 173406744.

The previous prime is 520221203. The next prime is 520221209. The reversal of 520221204 is 402122025.

520221204 is a `hidden beast` number, since 520 + 22 + 120 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520221203) 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 11 ways as a sum of consecutive naturals, for example, 266632 + ... + 268575.

Almost surely, 2^520221204 is an apocalyptic number.

520221204 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

520221204 is an abundant number, since it is smaller than the sum of its proper divisors (843488780).

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

520221204 is a wasteful number, since it uses less digits than its factorization.

520221204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535226 (or 535212 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 520221204 is about 22808.3582048336. The cubic root of 520221204 is about 804.2591612737.

Adding to 520221204 its reverse (402122025), we get a palindrome (922343229).

The spelling of 520221204 in words is "five hundred twenty million, two hundred twenty-one thousand, two hundred four".