20449489 has 2 divisors, whose sum is σ = 20449490. Its totient is φ = 20449488.

The previous prime is 20449483. The next prime is 20449501. The reversal of 20449489 is 98494402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18558864 + 1890625 = 4308^2 + 1375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20449489 is a prime.

It is a super-2 number, since 2×20449489² = 836363200722242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20449483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10224744 + 10224745.

It is an arithmetic number, because the mean of its divisors is an integer number (10224745).

Almost surely, 2^20449489 is an apocalyptic number.

It is an amenable number.

20449489 is a deficient number, since it is larger than the sum of its proper divisors (1).

20449489 is an equidigital number, since it uses as much as digits as its factorization.

20449489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 20449489 is about 4522.1111220314. Note that the first 4 decimals coincide. The cubic root of 20449489 is about 273.4602165552.

The spelling of 20449489 in words is "twenty million, four hundred forty-nine thousand, four hundred eighty-nine".