20303149 has 2 divisors, whose sum is σ = 20303150. Its totient is φ = 20303148.

The previous prime is 20303147. The next prime is 20303197. The reversal of 20303149 is 94130302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19053225 + 1249924 = 4365^2 + 1118^2 .

It is a cyclic number.

It is not a de Polignac number, because 20303149 - 2¹ = 20303147 is a prime.

Together with 20303147, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20303141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10151574 + 10151575.

It is an arithmetic number, because the mean of its divisors is an integer number (10151575).

Almost surely, 2^20303149 is an apocalyptic number.

It is an amenable number.

20303149 is a deficient number, since it is larger than the sum of its proper divisors (1).

20303149 is an equidigital number, since it uses as much as digits as its factorization.

20303149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 20303149 is about 4505.9015746019. The cubic root of 20303149 is about 272.8063451496.

The spelling of 20303149 in words is "twenty million, three hundred three thousand, one hundred forty-nine".