204631220 has 24 divisors (see below), whose sum is σ = 430768800. Its totient is φ = 81653792.

The previous prime is 204631211. The next prime is 204631223. The reversal of 204631220 is 22136402.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 204631192 and 204631201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204631223) 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 7 ways as a sum of consecutive naturals, for example, 3830 + ... + 20589.

It is an arithmetic number, because the mean of its divisors is an integer number (17948700).

Almost surely, 2^204631220 is an apocalyptic number.

204631220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204631220 is an abundant number, since it is smaller than the sum of its proper divisors (226137580).

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

204631220 is a wasteful number, since it uses less digits than its factorization.

204631220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24847 (or 24845 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 204631220 is about 14304.9369100321. The cubic root of 204631220 is about 589.2830705833.

Adding to 204631220 its reverse (22136402), we get a palindrome (226767622).

The spelling of 204631220 in words is "two hundred four million, six hundred thirty-one thousand, two hundred twenty".