20371849 has 4 divisors (see below), whose sum is σ = 20501764. Its totient is φ = 20241936.

The previous prime is 20371847. The next prime is 20371853. The reversal of 20371849 is 94817302.

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 3356224 + 17015625 = 1832^2 + 4125^2 .

It is a cyclic number.

It is not a de Polignac number, because 20371849 - 2¹ = 20371847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20371847) 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 3 ways as a sum of consecutive naturals, for example, 64722 + ... + 65035.

It is an arithmetic number, because the mean of its divisors is an integer number (5125441).

Almost surely, 2^20371849 is an apocalyptic number.

It is an amenable number.

20371849 is a deficient number, since it is larger than the sum of its proper divisors (129915).

20371849 is a wasteful number, since it uses less digits than its factorization.

20371849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129914.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 20371849 is about 4513.5184723229. The cubic root of 20371849 is about 273.1136980733.

The spelling of 20371849 in words is "twenty million, three hundred seventy-one thousand, eight hundred forty-nine".