128306020 has 12 divisors (see below), whose sum is σ = 269442684. Its totient is φ = 51322400.

The previous prime is 128305999. The next prime is 128306027. The reversal of 128306020 is 20603821.

It can be written as a sum of positive squares in 2 ways, for example, as 42484324 + 85821696 = 6518^2 + 9264^2 .

It is a junction number, because it is equal to n+sod(n) for n = 128305982 and 128306000.

It is not an unprimeable number, because it can be changed into a prime (128306027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3207631 + ... + 3207670.

It is an arithmetic number, because the mean of its divisors is an integer number (22453557).

Almost surely, 2^128306020 is an apocalyptic number.

128306020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128306020 is an abundant number, since it is smaller than the sum of its proper divisors (141136664).

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

128306020 is a wasteful number, since it uses less digits than its factorization.

128306020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6415310 (or 6415308 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 128306020 is about 11327.2247262955. The cubic root of 128306020 is about 504.3697263987.

Adding to 128306020 its reverse (20603821), we get a palindrome (148909841).

The spelling of 128306020 in words is "one hundred twenty-eight million, three hundred six thousand, twenty".