20449463 has 4 divisors (see below), whose sum is σ = 20493720. Its totient is φ = 20405208.

The previous prime is 20449433. The next prime is 20449469. The reversal of 20449463 is 36494402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20449463 - 2⁶ = 20449399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20449469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21428 + ... + 22361.

It is an arithmetic number, because the mean of its divisors is an integer number (5123430).

Almost surely, 2^20449463 is an apocalyptic number.

20449463 is a deficient number, since it is larger than the sum of its proper divisors (44257).

20449463 is an equidigital number, since it uses as much as digits as its factorization.

20449463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44256.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 20449463 is about 4522.1082472670. The cubic root of 20449463 is about 273.4601006604.

The spelling of 20449463 in words is "twenty million, four hundred forty-nine thousand, four hundred sixty-three".