20290349 has 2 divisors, whose sum is σ = 20290350. Its totient is φ = 20290348.

The previous prime is 20290331. The next prime is 20290379. The reversal of 20290349 is 94309202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16362025 + 3928324 = 4045^2 + 1982^2 .

It is a cyclic number.

It is not a de Polignac number, because 20290349 - 2⁸ = 20290093 is a prime.

It is a Sophie Germain prime.

It is a Chen 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 (20290379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10145174 + 10145175.

It is an arithmetic number, because the mean of its divisors is an integer number (10145175).

Almost surely, 2^20290349 is an apocalyptic number.

It is an amenable number.

20290349 is a deficient number, since it is larger than the sum of its proper divisors (1).

20290349 is an equidigital number, since it uses as much as digits as its factorization.

20290349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 20290349 is about 4504.4809911909. The cubic root of 20290349 is about 272.7490033830.

The spelling of 20290349 in words is "twenty million, two hundred ninety thousand, three hundred forty-nine".