20448949 has 2 divisors, whose sum is σ = 20448950. Its totient is φ = 20448948.

The previous prime is 20448941. The next prime is 20448991. The reversal of 20448949 is 94984402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12552849 + 7896100 = 3543^2 + 2810^2 .

It is a cyclic number.

It is not a de Polignac number, because 20448949 - 2³ = 20448941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20448941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10224474 + 10224475.

It is an arithmetic number, because the mean of its divisors is an integer number (10224475).

Almost surely, 2^20448949 is an apocalyptic number.

It is an amenable number.

20448949 is a deficient number, since it is larger than the sum of its proper divisors (1).

20448949 is an equidigital number, since it uses as much as digits as its factorization.

20448949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 20448949 is about 4522.0514150107. The cubic root of 20448949 is about 273.4578094890.

The spelling of 20448949 in words is "twenty million, four hundred forty-eight thousand, nine hundred forty-nine".