20307449 has 8 divisors (see below), whose sum is σ = 21308160. Its totient is φ = 19328400.

The previous prime is 20307439. The next prime is 20307457. The reversal of 20307449 is 94470302.

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 20307449 - 2⁴ = 20307433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20307439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3479 + ... + 7260.

It is an arithmetic number, because the mean of its divisors is an integer number (2663520).

Almost surely, 2^20307449 is an apocalyptic number.

It is an amenable number.

20307449 is a deficient number, since it is larger than the sum of its proper divisors (1000711).

20307449 is a wasteful number, since it uses less digits than its factorization.

20307449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10831.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 20307449 is about 4506.3787013521. The cubic root of 20307449 is about 272.8256029911.

The spelling of 20307449 in words is "twenty million, three hundred seven thousand, four hundred forty-nine".