20908603 has 2 divisors, whose sum is σ = 20908604. Its totient is φ = 20908602.

The previous prime is 20908513. The next prime is 20908609. The reversal of 20908603 is 30680902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20908603 - 2¹⁷ = 20777531 is a prime.

It is not a weakly prime, because it can be changed into another prime (20908609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10454301 + 10454302.

It is an arithmetic number, because the mean of its divisors is an integer number (10454302).

Almost surely, 2^20908603 is an apocalyptic number.

20908603 is a deficient number, since it is larger than the sum of its proper divisors (1).

20908603 is an equidigital number, since it uses as much as digits as its factorization.

20908603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 20908603 is about 4572.5925906426. The cubic root of 20908603 is about 275.4915857391.

The spelling of 20908603 in words is "twenty million, nine hundred eight thousand, six hundred three".