255404100020 has 24 divisors (see below), whose sum is σ = 538062197064. Its totient is φ = 101835242496.

The previous prime is 255404100011. The next prime is 255404100037. The reversal of 255404100020 is 20001404552.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13816121764 + 241587978256 = 117542^2 + 491516^2 .

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, 20393429 + ... + 20405948.

It is an arithmetic number, because the mean of its divisors is an integer number (22419258211).

Almost surely, 2^255404100020 is an apocalyptic number.

255404100020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255404100020 is an abundant number, since it is smaller than the sum of its proper divisors (282658097044).

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

255404100020 is a wasteful number, since it uses less digits than its factorization.

255404100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40799699 (or 40799697 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

Adding to 255404100020 its reverse (20001404552), we get a palindrome (275405504572).

The spelling of 255404100020 in words is "two hundred fifty-five billion, four hundred four million, one hundred thousand, twenty".