20731449 has 8 divisors (see below), whose sum is σ = 29268000. Its totient is φ = 13007936.

The previous prime is 20731429. The next prime is 20731453. The reversal of 20731449 is 94413702.

It is a happy number.

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 20731449 - 2¹² = 20727353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20731409) 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, 203199 + ... + 203300.

It is an arithmetic number, because the mean of its divisors is an integer number (3658500).

Almost surely, 2^20731449 is an apocalyptic number.

It is an amenable number.

20731449 is a deficient number, since it is larger than the sum of its proper divisors (8536551).

20731449 is a wasteful number, since it uses less digits than its factorization.

20731449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406519.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 20731449 is about 4553.1800974703. The cubic root of 20731449 is about 274.7113179980.

The spelling of 20731449 in words is "twenty million, seven hundred thirty-one thousand, four hundred forty-nine".