20249389 has 8 divisors (see below), whose sum is σ = 20596248. Its totient is φ = 19905600.

The previous prime is 20249387. The next prime is 20249399. The reversal of 20249389 is 98394202.

It can be written as a sum of positive squares in 4 ways, for example, as 7590025 + 12659364 = 2755^2 + 3558^2 .

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 20249389 - 2¹ = 20249387 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 (20249387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15219 + ... + 16495.

It is an arithmetic number, because the mean of its divisors is an integer number (2574531).

Almost surely, 2^20249389 is an apocalyptic number.

It is an amenable number.

20249389 is a deficient number, since it is larger than the sum of its proper divisors (346859).

20249389 is a wasteful number, since it uses less digits than its factorization.

20249389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1535.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 20249389 is about 4499.9321105990. The cubic root of 20249389 is about 272.5653475128.

The spelling of 20249389 in words is "twenty million, two hundred forty-nine thousand, three hundred eighty-nine".