20243149 has 2 divisors, whose sum is σ = 20243150. Its totient is φ = 20243148.

The previous prime is 20243143. The next prime is 20243161. The reversal of 20243149 is 94134202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13638249 + 6604900 = 3693^2 + 2570^2 .

It is a cyclic number.

It is not a de Polignac number, because 20243149 - 2⁵ = 20243117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20243143) 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 as a sum of consecutive naturals, namely, 10121574 + 10121575.

It is an arithmetic number, because the mean of its divisors is an integer number (10121575).

Almost surely, 2^20243149 is an apocalyptic number.

It is an amenable number.

20243149 is a deficient number, since it is larger than the sum of its proper divisors (1).

20243149 is an equidigital number, since it uses as much as digits as its factorization.

20243149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 20243149 is about 4499.2387133825. The cubic root of 20243149 is about 272.5373469560.

The spelling of 20243149 in words is "twenty million, two hundred forty-three thousand, one hundred forty-nine".