20705203 has 2 divisors, whose sum is σ = 20705204. Its totient is φ = 20705202.

The previous prime is 20705197. The next prime is 20705261. The reversal of 20705203 is 30250702.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20705203 - 2⁵ = 20705171 is a prime.

It is not a weakly prime, because it can be changed into another prime (20705273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10352601 + 10352602.

It is an arithmetic number, because the mean of its divisors is an integer number (10352602).

Almost surely, 2^20705203 is an apocalyptic number.

20705203 is a deficient number, since it is larger than the sum of its proper divisors (1).

20705203 is an equidigital number, since it uses as much as digits as its factorization.

20705203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 420, while the sum is 19.

The square root of 20705203 is about 4550.2970232722. The cubic root of 20705203 is about 274.5953409294.

Adding to 20705203 its reverse (30250702), we get a palindrome (50955905).

The spelling of 20705203 in words is "twenty million, seven hundred five thousand, two hundred three".