204431440421020 has 24 divisors (see below), whose sum is σ = 429308479931184. Its totient is φ = 81772108540416.

The previous prime is 204431440421011. The next prime is 204431440421053. The reversal of 204431440421020 is 20124044134402.

It is a happy number.

It is a super-2 number, since 2×204431440421020² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25631194 + ... + 32646913.

It is an arithmetic number, because the mean of its divisors is an integer number (17887853330466).

Almost surely, 2^{204431440421020} is an apocalyptic number.

204431440421020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204431440421020 is an abundant number, since it is smaller than the sum of its proper divisors (224877039510164).

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

204431440421020 is a wasteful number, since it uses less digits than its factorization.

204431440421020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58453509 (or 58453507 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 31.

Adding to 204431440421020 its reverse (20124044134402), we get a palindrome (224555484555422).

The spelling of 204431440421020 in words is "two hundred four trillion, four hundred thirty-one billion, four hundred forty million, four hundred twenty-one thousand, twenty".