20903101 has 2 divisors, whose sum is σ = 20903102. Its totient is φ = 20903100.

The previous prime is 20903089. The next prime is 20903111. The reversal of 20903101 is 10130902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16597476 + 4305625 = 4074^2 + 2075^2 .

It is a cyclic number.

It is not a de Polignac number, because 20903101 - 2⁹ = 20902589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20903111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10451550 + 10451551.

It is an arithmetic number, because the mean of its divisors is an integer number (10451551).

Almost surely, 2^20903101 is an apocalyptic number.

It is an amenable number.

20903101 is a deficient number, since it is larger than the sum of its proper divisors (1).

20903101 is an equidigital number, since it uses as much as digits as its factorization.

20903101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 20903101 is about 4571.9909230006. The cubic root of 20903101 is about 275.4674188499.

The spelling of 20903101 in words is "twenty million, nine hundred three thousand, one hundred one".