128030020 has 24 divisors (see below), whose sum is σ = 269166744. Its totient is φ = 51154176.

The previous prime is 128029991. The next prime is 128030051. The reversal of 128030020 is 20030821.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 36942084 + 91087936 = 6078^2 + 9544^2 .

It is a junction number, because it is equal to n+sod(n) for n = 128029976 and 128030003.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17562 + ... + 23758.

It is an arithmetic number, because the mean of its divisors is an integer number (11215281).

Almost surely, 2^128030020 is an apocalyptic number.

128030020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128030020 is an abundant number, since it is smaller than the sum of its proper divisors (141136724).

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

128030020 is a wasteful number, since it uses less digits than its factorization.

128030020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7239 (or 7237 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 128030020 is about 11315.0351303034. The cubic root of 128030020 is about 504.0078156594.

Adding to 128030020 its reverse (20030821), we get a palindrome (148060841).

The spelling of 128030020 in words is "one hundred twenty-eight million, thirty thousand, twenty".