20013789 has 4 divisors (see below), whose sum is σ = 26685056. Its totient is φ = 13342524.

The previous prime is 20013779. The next prime is 20013793. The reversal of 20013789 is 98731002.

It is a happy number.

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 not a de Polignac number, because 20013789 - 2⁵ = 20013757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3335629 + ... + 3335634.

It is an arithmetic number, because the mean of its divisors is an integer number (6671264).

Almost surely, 2^20013789 is an apocalyptic number.

It is an amenable number.

20013789 is a deficient number, since it is larger than the sum of its proper divisors (6671267).

20013789 is an equidigital number, since it uses as much as digits as its factorization.

20013789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6671266.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 20013789 is about 4473.6773464344. The cubic root of 20013789 is about 271.5041291695.

It can be divided in two parts, 20013 and 789, that added together give a palindrome (20802).

The spelling of 20013789 in words is "twenty million, thirteen thousand, seven hundred eighty-nine".