20128459 has 8 divisors (see below), whose sum is σ = 22952160. Its totient is φ = 17486976.

The previous prime is 20128453. The next prime is 20128469. The reversal of 20128459 is 95482102.

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

It is not a de Polignac number, because 20128459 - 2¹⁹ = 19604171 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20128459.

It is not an unprimeable number, because it can be changed into a prime (20128453) 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, 45319 + ... + 45760.

It is an arithmetic number, because the mean of its divisors is an integer number (2869020).

Almost surely, 2^20128459 is an apocalyptic number.

20128459 is a deficient number, since it is larger than the sum of its proper divisors (2823701).

20128459 is a wasteful number, since it uses less digits than its factorization.

20128459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91109.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 20128459 is about 4486.4751197349. The cubic root of 20128459 is about 272.0216741307.

The spelling of 20128459 in words is "twenty million, one hundred twenty-eight thousand, four hundred fifty-nine".