251868020 has 24 divisors (see below), whose sum is σ = 529250568. Its totient is φ = 100684800.

The previous prime is 251868017. The next prime is 251868041. The reversal of 251868020 is 20868152.

251868020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 16613776 + 235254244 = 4076^2 + 15338^2 .

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, 42860 + ... + 48380.

It is an arithmetic number, because the mean of its divisors is an integer number (22052107).

Almost surely, 2^251868020 is an apocalyptic number.

251868020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251868020 is an abundant number, since it is smaller than the sum of its proper divisors (277382548).

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

251868020 is a wasteful number, since it uses less digits than its factorization.

251868020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7811 (or 7809 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 251868020 is about 15870.3503426988. The cubic root of 251868020 is about 631.5256715758.

The spelling of 251868020 in words is "two hundred fifty-one million, eight hundred sixty-eight thousand, twenty".