20706503 has 2 divisors, whose sum is σ = 20706504. Its totient is φ = 20706502.

The previous prime is 20706457. The next prime is 20706557. The reversal of 20706503 is 30560702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20706503 - 2⁸ = 20706247 is a prime.

It is a Sophie Germain 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 (20706563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10353251 + 10353252.

It is an arithmetic number, because the mean of its divisors is an integer number (10353252).

Almost surely, 2^20706503 is an apocalyptic number.

20706503 is a deficient number, since it is larger than the sum of its proper divisors (1).

20706503 is an equidigital number, since it uses as much as digits as its factorization.

20706503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 20706503 is about 4550.4398688478. The cubic root of 20706503 is about 274.6010877373.

The spelling of 20706503 in words is "twenty million, seven hundred six thousand, five hundred three".