20115449 has 2 divisors, whose sum is σ = 20115450. Its totient is φ = 20115448.

The previous prime is 20115439. The next prime is 20115451. The reversal of 20115449 is 94451102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19669225 + 446224 = 4435^2 + 668^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20115449 is a prime.

It is a super-3 number, since 3×20115449³ (a number of 23 digits) contains 333 as substring.

Together with 20115451, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20115439) 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 as a sum of consecutive naturals, namely, 10057724 + 10057725.

It is an arithmetic number, because the mean of its divisors is an integer number (10057725).

Almost surely, 2^20115449 is an apocalyptic number.

It is an amenable number.

20115449 is a deficient number, since it is larger than the sum of its proper divisors (1).

20115449 is an equidigital number, since it uses as much as digits as its factorization.

20115449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 20115449 is about 4485.0249720598. The cubic root of 20115449 is about 271.9630545624.

The spelling of 20115449 in words is "twenty million, one hundred fifteen thousand, four hundred forty-nine".