20499449 has 2 divisors, whose sum is σ = 20499450. Its totient is φ = 20499448.

The previous prime is 20499431. The next prime is 20499481. The reversal of 20499449 is 94499402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18003049 + 2496400 = 4243^2 + 1580^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20499449 is a prime.

It is not a weakly prime, because it can be changed into another prime (20499749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10249724 + 10249725.

It is an arithmetic number, because the mean of its divisors is an integer number (10249725).

Almost surely, 2^20499449 is an apocalyptic number.

It is an amenable number.

20499449 is a deficient number, since it is larger than the sum of its proper divisors (1).

20499449 is an equidigital number, since it uses as much as digits as its factorization.

20499449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 20499449 is about 4527.6317208890. The cubic root of 20499449 is about 273.6827316767.

The spelling of 20499449 in words is "twenty million, four hundred ninety-nine thousand, four hundred forty-nine".