20298309 has 8 divisors (see below), whose sum is σ = 27259680. Its totient is φ = 13434576.

The previous prime is 20298293. The next prime is 20298337. The reversal of 20298309 is 90389202.

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

It is not a de Polignac number, because 20298309 - 2⁴ = 20298293 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20298309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20298359) 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, 23922 + ... + 24755.

It is an arithmetic number, because the mean of its divisors is an integer number (3407460).

Almost surely, 2^20298309 is an apocalyptic number.

It is an amenable number.

20298309 is a deficient number, since it is larger than the sum of its proper divisors (6961371).

20298309 is a wasteful number, since it uses less digits than its factorization.

20298309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48819.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 20298309 is about 4505.3644691634. The cubic root of 20298309 is about 272.7846656284.

The spelling of 20298309 in words is "twenty million, two hundred ninety-eight thousand, three hundred nine".