20105049 has 8 divisors (see below), whose sum is σ = 27377280. Its totient is φ = 13118096.

The previous prime is 20105039. The next prime is 20105053. The reversal of 20105049 is 94050102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20105049 - 2⁹ = 20104537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20105009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71154 + ... + 71435.

It is an arithmetic number, because the mean of its divisors is an integer number (3422160).

Almost surely, 2^20105049 is an apocalyptic number.

It is an amenable number.

20105049 is a deficient number, since it is larger than the sum of its proper divisors (7272231).

20105049 is a wasteful number, since it uses less digits than its factorization.

20105049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142639.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 20105049 is about 4483.8654083280. The cubic root of 20105049 is about 271.9161767729.

The spelling of 20105049 in words is "twenty million, one hundred five thousand, forty-nine".