20948149 has 2 divisors, whose sum is σ = 20948150. Its totient is φ = 20948148.

The previous prime is 20948143. The next prime is 20948159. The reversal of 20948149 is 94184902.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20566225 + 381924 = 4535^2 + 618^2 .

It is a cyclic number.

It is not a de Polignac number, because 20948149 - 2⁵ = 20948117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20948143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10474074 + 10474075.

It is an arithmetic number, because the mean of its divisors is an integer number (10474075).

Almost surely, 2^20948149 is an apocalyptic number.

It is an amenable number.

20948149 is a deficient number, since it is larger than the sum of its proper divisors (1).

20948149 is an equidigital number, since it uses as much as digits as its factorization.

20948149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 20948149 is about 4576.9147905549. The cubic root of 20948149 is about 275.6651622788.

The spelling of 20948149 in words is "twenty million, nine hundred forty-eight thousand, one hundred forty-nine".