255531340020 has 96 divisors (see below), whose sum is σ = 783940993920. Its totient is φ = 61676444160.

The previous prime is 255531339989. The next prime is 255531340061. The reversal of 255531340020 is 20043135552.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a self number, because there is not a number n which added to its sum of digits gives 255531340020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 694207 + ... + 996486.

It is an arithmetic number, because the mean of its divisors is an integer number (8166052020).

Almost surely, 2^255531340020 is an apocalyptic number.

255531340020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255531340020 is an abundant number, since it is smaller than the sum of its proper divisors (528409653900).

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

255531340020 is a wasteful number, since it uses less digits than its factorization.

255531340020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1690945 (or 1690943 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 30.

Adding to 255531340020 its reverse (20043135552), we get a palindrome (275574475572).

The spelling of 255531340020 in words is "two hundred fifty-five billion, five hundred thirty-one million, three hundred forty thousand, twenty".