251065020 has 48 divisors (see below), whose sum is σ = 714516768. Its totient is φ = 65852160.

The previous prime is 251065019. The next prime is 251065043. The reversal of 251065020 is 20560152.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30639 + ... + 37958.

It is an arithmetic number, because the mean of its divisors is an integer number (14885766).

Almost surely, 2^251065020 is an apocalyptic number.

251065020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251065020 is an abundant number, since it is smaller than the sum of its proper divisors (463451748).

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

251065020 is a wasteful number, since it uses less digits than its factorization.

251065020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68670 (or 68668 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 251065020 is about 15845.0313978862. The cubic root of 251065020 is about 630.8538183896.

The spelling of 251065020 in words is "two hundred fifty-one million, sixty-five thousand, twenty".