20173949 has 2 divisors, whose sum is σ = 20173950. Its totient is φ = 20173948.

The previous prime is 20173943. The next prime is 20173957. The reversal of 20173949 is 94937102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11868025 + 8305924 = 3445^2 + 2882^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20173949 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20173943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10086974 + 10086975.

It is an arithmetic number, because the mean of its divisors is an integer number (10086975).

Almost surely, 2^20173949 is an apocalyptic number.

It is an amenable number.

20173949 is a deficient number, since it is larger than the sum of its proper divisors (1).

20173949 is an equidigital number, since it uses as much as digits as its factorization.

20173949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 20173949 is about 4491.5419401359. The cubic root of 20173949 is about 272.2264415160.

The spelling of 20173949 in words is "twenty million, one hundred seventy-three thousand, nine hundred forty-nine".