20088749 has 4 divisors (see below), whose sum is σ = 20467836. Its totient is φ = 19709664.

The previous prime is 20088737. The next prime is 20088763. The reversal of 20088749 is 94788002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17222500 + 2866249 = 4150^2 + 1693^2 .

It is a cyclic number.

It is not a de Polignac number, because 20088749 - 2²⁰ = 19040173 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 (20088769) 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, 189464 + ... + 189569.

It is an arithmetic number, because the mean of its divisors is an integer number (5116959).

Almost surely, 2^20088749 is an apocalyptic number.

It is an amenable number.

20088749 is a deficient number, since it is larger than the sum of its proper divisors (379087).

20088749 is an equidigital number, since it uses as much as digits as its factorization.

20088749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379086.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 20088749 is about 4482.0474116189. The cubic root of 20088749 is about 271.8426723177.

The spelling of 20088749 in words is "twenty million, eighty-eight thousand, seven hundred forty-nine".