20261449 has 4 divisors (see below), whose sum is σ = 21820036. Its totient is φ = 18702864.

The previous prime is 20261431. The next prime is 20261497. The reversal of 20261449 is 94416202.

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 2663424 + 17598025 = 1632^2 + 4195^2 .

It is a cyclic number.

It is not a de Polignac number, because 20261449 - 2¹⁹ = 19737161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20261419) 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, 779274 + ... + 779299.

It is an arithmetic number, because the mean of its divisors is an integer number (5455009).

Almost surely, 2^20261449 is an apocalyptic number.

It is an amenable number.

20261449 is a deficient number, since it is larger than the sum of its proper divisors (1558587).

20261449 is a wasteful number, since it uses less digits than its factorization.

20261449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1558586.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 20261449 is about 4501.2719313545. The cubic root of 20261449 is about 272.6194476757.

The spelling of 20261449 in words is "twenty million, two hundred sixty-one thousand, four hundred forty-nine".