20384149 has 2 divisors, whose sum is σ = 20384150. Its totient is φ = 20384148.

The previous prime is 20384113. The next prime is 20384159. The reversal of 20384149 is 94148302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17766225 + 2617924 = 4215^2 + 1618^2 .

It is a cyclic number.

It is not a de Polignac number, because 20384149 - 2¹¹ = 20382101 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20384149.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20384159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10192074 + 10192075.

It is an arithmetic number, because the mean of its divisors is an integer number (10192075).

Almost surely, 2^20384149 is an apocalyptic number.

It is an amenable number.

20384149 is a deficient number, since it is larger than the sum of its proper divisors (1).

20384149 is an equidigital number, since it uses as much as digits as its factorization.

20384149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 20384149 is about 4514.8808400665. The cubic root of 20384149 is about 273.1686533636.

The spelling of 20384149 in words is "twenty million, three hundred eighty-four thousand, one hundred forty-nine".