20249123 has 2 divisors, whose sum is σ = 20249124. Its totient is φ = 20249122.

The previous prime is 20249113. The next prime is 20249137. The reversal of 20249123 is 32194202.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20249123 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20249113) 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, 10124561 + 10124562.

It is an arithmetic number, because the mean of its divisors is an integer number (10124562).

Almost surely, 2^20249123 is an apocalyptic number.

20249123 is a deficient number, since it is larger than the sum of its proper divisors (1).

20249123 is an equidigital number, since it uses as much as digits as its factorization.

20249123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 20249123 is about 4499.9025545005. The cubic root of 20249123 is about 272.5641540168.

The spelling of 20249123 in words is "twenty million, two hundred forty-nine thousand, one hundred twenty-three".