20443849 has 16 divisors (see below), whose sum is σ = 22477824. Its totient is φ = 18532800.

The previous prime is 20443837. The next prime is 20443853. The reversal of 20443849 is 94834402.

It is a cyclic number.

It is not a de Polignac number, because 20443849 - 2¹⁹ = 19919561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20443879) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37519 + ... + 38059.

It is an arithmetic number, because the mean of its divisors is an integer number (1404864).

Almost surely, 2^20443849 is an apocalyptic number.

It is an amenable number.

20443849 is a deficient number, since it is larger than the sum of its proper divisors (2033975).

20443849 is a wasteful number, since it uses less digits than its factorization.

20443849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648.

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 20443849 is about 4521.4874764838. The cubic root of 20443849 is about 273.4350739964.

The spelling of 20443849 in words is "twenty million, four hundred forty-three thousand, eight hundred forty-nine".