20840503 has 2 divisors, whose sum is σ = 20840504. Its totient is φ = 20840502.

The previous prime is 20840489. The next prime is 20840513. The reversal of 20840503 is 30504802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20840503 - 2⁵ = 20840471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20840513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10420251 + 10420252.

It is an arithmetic number, because the mean of its divisors is an integer number (10420252).

Almost surely, 2^20840503 is an apocalyptic number.

20840503 is a deficient number, since it is larger than the sum of its proper divisors (1).

20840503 is an equidigital number, since it uses as much as digits as its factorization.

20840503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 20840503 is about 4565.1399759482. The cubic root of 20840503 is about 275.1921654113.

The spelling of 20840503 in words is "twenty million, eight hundred forty thousand, five hundred three".