20128508475783 has 8 divisors (see below), whose sum is σ = 27075515826288. Its totient is φ = 13300253387904.

The previous prime is 20128508475731. The next prime is 20128508475809. The reversal of 20128508475783 is 38757480582102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20128508475783 - 2¹⁶ = 20128508410247 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20128508475703) 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, 29688065260 + ... + 29688065937.

It is an arithmetic number, because the mean of its divisors is an integer number (3384439478286).

Almost surely, 2^{20128508475783} is an apocalyptic number.

20128508475783 is a deficient number, since it is larger than the sum of its proper divisors (6947007350505).

20128508475783 is a wasteful number, since it uses less digits than its factorization.

20128508475783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59376131313.

The product of its (nonzero) digits is 30105600, while the sum is 60.

The spelling of 20128508475783 in words is "twenty trillion, one hundred twenty-eight billion, five hundred eight million, four hundred seventy-five thousand, seven hundred eighty-three".