251255020 has 24 divisors (see below), whose sum is σ = 539907984. Its totient is φ = 98164416.

The previous prime is 251255009. The next prime is 251255021. The reversal of 251255020 is 20552152.

It is a junction number, because it is equal to n+sod(n) for n = 251254982 and 251255000.

It is not an unprimeable number, because it can be changed into a prime (251255021) 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, 145219 + ... + 146938.

It is an arithmetic number, because the mean of its divisors is an integer number (22496166).

Almost surely, 2^251255020 is an apocalyptic number.

251255020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251255020 is an abundant number, since it is smaller than the sum of its proper divisors (288652964).

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

251255020 is a wasteful number, since it uses less digits than its factorization.

251255020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292209 (or 292207 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 251255020 is about 15851.0258343112. The cubic root of 251255020 is about 631.0129166210.

The spelling of 251255020 in words is "two hundred fifty-one million, two hundred fifty-five thousand, twenty".