1328632020 has 72 divisors (see below), whose sum is σ = 4069368576. Its totient is φ = 350857152.

The previous prime is 1328631977. The next prime is 1328632031. The reversal of 1328632020 is 202368231.

1328632020 is a `hidden beast` number, since 1 + 3 + 2 + 8 + 632 + 0 + 20 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17292 + ... + 54371.

It is an arithmetic number, because the mean of its divisors is an integer number (56519008).

Almost surely, 2^1328632020 is an apocalyptic number.

1328632020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1328632020 is an abundant number, since it is smaller than the sum of its proper divisors (2740736556).

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

1328632020 is a wasteful number, since it uses less digits than its factorization.

1328632020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71781 (or 71776 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 1328632020 is about 36450.4049360223. The cubic root of 1328632020 is about 1099.3472766723.

The spelling of 1328632020 in words is "one billion, three hundred twenty-eight million, six hundred thirty-two thousand, twenty".