20578859789 has 4 divisors (see below), whose sum is σ = 20726909280. Its totient is φ = 20430810300.

The previous prime is 20578859773. The next prime is 20578859801. The reversal of 20578859789 is 98795887502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20578859789 - 2⁴ = 20578859773 is a prime.

It is a super-2 number, since 2×20578859789² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20578855789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74024537 + ... + 74024814.

It is an arithmetic number, because the mean of its divisors is an integer number (5181727320).

Almost surely, 2^20578859789 is an apocalyptic number.

It is an amenable number.

20578859789 is a deficient number, since it is larger than the sum of its proper divisors (148049491).

20578859789 is a wasteful number, since it uses less digits than its factorization.

20578859789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148049490.

The product of its (nonzero) digits is 101606400, while the sum is 68.

The spelling of 20578859789 in words is "twenty billion, five hundred seventy-eight million, eight hundred fifty-nine thousand, seven hundred eighty-nine".