256601020 has 24 divisors (see below), whose sum is σ = 580313664. Its totient is φ = 94744896.

The previous prime is 256601017. The next prime is 256601021. The reversal of 256601020 is 20106652.

It is a junction number, because it is equal to n+sod(n) for n = 256600982 and 256601000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256601021) 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, 493204 + ... + 493723.

It is an arithmetic number, because the mean of its divisors is an integer number (24179736).

Almost surely, 2^256601020 is an apocalyptic number.

256601020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256601020 is an abundant number, since it is smaller than the sum of its proper divisors (323712644).

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

256601020 is a wasteful number, since it uses less digits than its factorization.

256601020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986949 (or 986947 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 256601020 is about 16018.7708642080. The cubic root of 256601020 is about 635.4569385614.

Adding to 256601020 its reverse (20106652), we get a palindrome (276707672).

The spelling of 256601020 in words is "two hundred fifty-six million, six hundred one thousand, twenty".