20304997 has 2 divisors, whose sum is σ = 20304998. Its totient is φ = 20304996.

The previous prime is 20304983. The next prime is 20305003. The reversal of 20304997 is 79940302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20304036 + 961 = 4506^2 + 31^2 .

It is a cyclic number.

It is not a de Polignac number, because 20304997 - 2¹¹ = 20302949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20304937) 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, 10152498 + 10152499.

It is an arithmetic number, because the mean of its divisors is an integer number (10152499).

Almost surely, 2^20304997 is an apocalyptic number.

It is an amenable number.

20304997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20304997 is an equidigital number, since it uses as much as digits as its factorization.

20304997 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 34.

The square root of 20304997 is about 4506.1066343352. The cubic root of 20304997 is about 272.8146218760.

The spelling of 20304997 in words is "twenty million, three hundred four thousand, nine hundred ninety-seven".