20415149 has 2 divisors, whose sum is σ = 20415150. Its totient is φ = 20415148.

The previous prime is 20415133. The next prime is 20415163. The reversal of 20415149 is 94151402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14115049 + 6300100 = 3757^2 + 2510^2 .

It is a cyclic number.

It is not a de Polignac number, because 20415149 - 2⁴ = 20415133 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20415119) 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, 10207574 + 10207575.

It is an arithmetic number, because the mean of its divisors is an integer number (10207575).

Almost surely, 2^20415149 is an apocalyptic number.

It is an amenable number.

20415149 is a deficient number, since it is larger than the sum of its proper divisors (1).

20415149 is an equidigital number, since it uses as much as digits as its factorization.

20415149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 20415149 is about 4518.3126275193. The cubic root of 20415149 is about 273.3070605655.

The spelling of 20415149 in words is "twenty million, four hundred fifteen thousand, one hundred forty-nine".