256047020 has 48 divisors (see below), whose sum is σ = 552696480. Its totient is φ = 99600384.

The previous prime is 256046981. The next prime is 256047031. The reversal of 256047020 is 20740652.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113342 + ... + 115578.

It is an arithmetic number, because the mean of its divisors is an integer number (11514510).

Almost surely, 2^256047020 is an apocalyptic number.

256047020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256047020 is an abundant number, since it is smaller than the sum of its proper divisors (296649460).

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

256047020 is a wasteful number, since it uses less digits than its factorization.

256047020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2402 (or 2400 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 256047020 is about 16001.4693075355. The cubic root of 256047020 is about 634.9992931978. Note that the first 3 decimals are identical.

Adding to 256047020 its reverse (20740652), we get a palindrome (276787672).

The spelling of 256047020 in words is "two hundred fifty-six million, forty-seven thousand, twenty".