20249109 has 10 divisors (see below), whose sum is σ = 30248790. Its totient is φ = 13499352.

The previous prime is 20249083. The next prime is 20249111. The reversal of 20249109 is 90194202.

It can be written as a sum of positive squares in only one way, i.e., 15186609 + 5062500 = 3897^2 + 2250^2 .

It is not a de Polignac number, because 20249109 - 2⁵ = 20249077 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20249179) 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 9 ways as a sum of consecutive naturals, for example, 124914 + ... + 125075.

It is an arithmetic number, because the mean of its divisors is an integer number (3024879).

Almost surely, 2^20249109 is an apocalyptic number.

It is an amenable number.

20249109 is a deficient number, since it is larger than the sum of its proper divisors (9999681).

20249109 is an equidigital number, since it uses as much as digits as its factorization.

20249109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250001 (or 249992 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 20249109 is about 4499.9009989110. The cubic root of 20249109 is about 272.5640912009.

The spelling of 20249109 in words is "twenty million, two hundred forty-nine thousand, one hundred nine".