20867449 has 4 divisors (see below), whose sum is σ = 22094964. Its totient is φ = 19639936.

The previous prime is 20867447. The next prime is 20867471. The reversal of 20867449 is 94476802.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16867449 + 4000000 = 4107^2 + 2000^2 .

It is a cyclic number.

It is not a de Polignac number, because 20867449 - 2¹ = 20867447 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20867447) 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, 613732 + ... + 613765.

It is an arithmetic number, because the mean of its divisors is an integer number (5523741).

Almost surely, 2^20867449 is an apocalyptic number.

It is an amenable number.

20867449 is a deficient number, since it is larger than the sum of its proper divisors (1227515).

20867449 is a wasteful number, since it uses less digits than its factorization.

20867449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1227514.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 20867449 is about 4568.0903012090. The cubic root of 20867449 is about 275.3107187633.

It can be divided in two parts, 20867 and 449, that added together give a square (21316 = 146²).

The spelling of 20867449 in words is "twenty million, eight hundred sixty-seven thousand, four hundred forty-nine".