20289789 has 36 divisors (see below), whose sum is σ = 33752628. Its totient is φ = 11635200.

The previous prime is 20289769. The next prime is 20289791. The reversal of 20289789 is 98798202.

It can be written as a sum of positive squares in 6 ways, for example, as 5336100 + 14953689 = 2310^2 + 3867^2 .

It is not a de Polignac number, because 20289789 - 2⁵ = 20289757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20289769) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 200839 + ... + 200939.

It is an arithmetic number, because the mean of its divisors is an integer number (937573).

Almost surely, 2^20289789 is an apocalyptic number.

It is an amenable number.

20289789 is a deficient number, since it is larger than the sum of its proper divisors (13462839).

20289789 is a wasteful number, since it uses less digits than its factorization.

20289789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 20289789 is about 4504.4188304375. The cubic root of 20289789 is about 272.7464941301.

The spelling of 20289789 in words is "twenty million, two hundred eighty-nine thousand, seven hundred eighty-nine".