20088809 has 8 divisors (see below), whose sum is σ = 21834120. Its totient is φ = 18372096.

The previous prime is 20088779. The next prime is 20088823. The reversal of 20088809 is 90888002.

It can be written as a sum of positive squares in 4 ways, for example, as 7507600 + 12581209 = 2740^2 + 3547^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20088809 - 2¹⁶ = 20023273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20088839) 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 7 ways as a sum of consecutive naturals, for example, 5672 + ... + 8505.

It is an arithmetic number, because the mean of its divisors is an integer number (2729265).

Almost surely, 2^20088809 is an apocalyptic number.

It is an amenable number.

20088809 is a deficient number, since it is larger than the sum of its proper divisors (1745311).

20088809 is a wasteful number, since it uses less digits than its factorization.

20088809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14299.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 20088809 is about 4482.0541049836. The cubic root of 20088809 is about 271.8429429592.

The spelling of 20088809 in words is "twenty million, eighty-eight thousand, eight hundred nine".