204040420 has 12 divisors (see below), whose sum is σ = 428484924. Its totient is φ = 81616160.

The previous prime is 204040399. The next prime is 204040423. The reversal of 204040420 is 24040402.

It can be written as a sum of positive squares in 2 ways, for example, as 154703844 + 49336576 = 12438^2 + 7024^2 .

It is a junction number, because it is equal to n+sod(n) for n = 204040394 and 204040403.

It is not an unprimeable number, because it can be changed into a prime (204040423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5100991 + ... + 5101030.

It is an arithmetic number, because the mean of its divisors is an integer number (35707077).

Almost surely, 2^204040420 is an apocalyptic number.

204040420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204040420 is an abundant number, since it is smaller than the sum of its proper divisors (224444504).

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

204040420 is a wasteful number, since it uses less digits than its factorization.

204040420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10202030 (or 10202028 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 204040420 is about 14284.2717700273. The cubic root of 204040420 is about 588.7154087048.

Adding to 204040420 its reverse (24040402), we get a palindrome (228080822).

The spelling of 204040420 in words is "two hundred four million, forty thousand, four hundred twenty".