251804020 has 48 divisors (see below), whose sum is σ = 571310208. Its totient is φ = 92672640.

The previous prime is 251804011. The next prime is 251804027. The reversal of 251804020 is 20408152.

It is a junction number, because it is equal to n+sod(n) for n = 251803982 and 251804000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251804027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88825 + ... + 91615.

It is an arithmetic number, because the mean of its divisors is an integer number (11902296).

Almost surely, 2^251804020 is an apocalyptic number.

251804020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 251804020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (285655104).

251804020 is an abundant number, since it is smaller than the sum of its proper divisors (319506188).

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

251804020 is a wasteful number, since it uses less digits than its factorization.

251804020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3160 (or 3158 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 251804020 is about 15868.3338759934. Note that the first 3 decimals coincide. The cubic root of 251804020 is about 631.4721765392.

The spelling of 251804020 in words is "two hundred fifty-one million, eight hundred four thousand, twenty".