251376402020 has 24 divisors (see below), whose sum is σ = 527909034744. Its totient is φ = 100547019776.

The previous prime is 251376401989. The next prime is 251376402023. The reversal of 251376402020 is 20204673152.

It can be written as a sum of positive squares in 4 ways, for example, as 57290337316 + 194086064704 = 239354^2 + 440552^2 .

It is not an unprimeable number, because it can be changed into a prime (251376402023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 403874 + ... + 816006.

It is an arithmetic number, because the mean of its divisors is an integer number (21996209781).

Almost surely, 2^251376402020 is an apocalyptic number.

251376402020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251376402020 is an abundant number, since it is smaller than the sum of its proper divisors (276532632724).

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

251376402020 is a wasteful number, since it uses less digits than its factorization.

251376402020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442639 (or 442637 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 32.

The spelling of 251376402020 in words is "two hundred fifty-one billion, three hundred seventy-six million, four hundred two thousand, twenty".