20284449 has 4 divisors (see below), whose sum is σ = 27045936. Its totient is φ = 13522964.

The previous prime is 20284441. The next prime is 20284469. The reversal of 20284449 is 94448202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20284449 - 2³ = 20284441 is a prime.

It is a super-2 number, since 2×20284449² = 822917742467202, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20284441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3380739 + ... + 3380744.

It is an arithmetic number, because the mean of its divisors is an integer number (6761484).

Almost surely, 2^20284449 is an apocalyptic number.

It is an amenable number.

20284449 is a deficient number, since it is larger than the sum of its proper divisors (6761487).

20284449 is an equidigital number, since it uses as much as digits as its factorization.

20284449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6761486.

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 20284449 is about 4503.8260401574. The cubic root of 20284449 is about 272.7225642925.

The spelling of 20284449 in words is "twenty million, two hundred eighty-four thousand, four hundred forty-nine".