251550204020 has 48 divisors (see below), whose sum is σ = 544775414400. Its totient is φ = 97521459840.

The previous prime is 251550204011. The next prime is 251550204067. The reversal of 251550204020 is 20402055152.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1417475 + ... + 1585034.

It is an arithmetic number, because the mean of its divisors is an integer number (11349487800).

Almost surely, 2^251550204020 is an apocalyptic number.

251550204020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251550204020 is an abundant number, since it is smaller than the sum of its proper divisors (293225210380).

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

251550204020 is a wasteful number, since it uses less digits than its factorization.

251550204020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3002648 (or 3002646 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 26.

Adding to 251550204020 its reverse (20402055152), we get a palindrome (271952259172).

The spelling of 251550204020 in words is "two hundred fifty-one billion, five hundred fifty million, two hundred four thousand, twenty".