256304705020 has 48 divisors (see below), whose sum is σ = 662449088448. Its totient is φ = 81116213760.

The previous prime is 256304705009. The next prime is 256304705087. The reversal of 256304705020 is 20507403652.

It is a super-3 number, since 3×256304705020³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70411561 + ... + 70415200.

It is an arithmetic number, because the mean of its divisors is an integer number (13801022676).

Almost surely, 2^256304705020 is an apocalyptic number.

256304705020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256304705020 is an abundant number, since it is smaller than the sum of its proper divisors (406144383428).

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

256304705020 is a wasteful number, since it uses less digits than its factorization.

256304705020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140826790 (or 140826788 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 34.

The spelling of 256304705020 in words is "two hundred fifty-six billion, three hundred four million, seven hundred five thousand, twenty".