20604149 has 2 divisors, whose sum is σ = 20604150. Its totient is φ = 20604148.

The previous prime is 20604139. The next prime is 20604173. The reversal of 20604149 is 94140602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14577124 + 6027025 = 3818^2 + 2455^2 .

It is a cyclic number.

It is not a de Polignac number, because 20604149 - 2⁸ = 20603893 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 (20604139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10302074 + 10302075.

It is an arithmetic number, because the mean of its divisors is an integer number (10302075).

Almost surely, 2^20604149 is an apocalyptic number.

It is an amenable number.

20604149 is a deficient number, since it is larger than the sum of its proper divisors (1).

20604149 is an equidigital number, since it uses as much as digits as its factorization.

20604149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20604149 is about 4539.1793311126. The cubic root of 20604149 is about 274.1478813493.

The spelling of 20604149 in words is "twenty million, six hundred four thousand, one hundred forty-nine".