20103509 has 2 divisors, whose sum is σ = 20103510. Its totient is φ = 20103508.

The previous prime is 20103493. The next prime is 20103511. The reversal of 20103509 is 90530102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17247409 + 2856100 = 4153^2 + 1690^2 .

It is a cyclic number.

It is not a de Polignac number, because 20103509 - 2⁴ = 20103493 is a prime.

It is a super-2 number, since 2×20103509² = 808302148226162, which contains 22 as substring.

Together with 20103511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20103599) 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, 10051754 + 10051755.

It is an arithmetic number, because the mean of its divisors is an integer number (10051755).

Almost surely, 2^20103509 is an apocalyptic number.

It is an amenable number.

20103509 is a deficient number, since it is larger than the sum of its proper divisors (1).

20103509 is an equidigital number, since it uses as much as digits as its factorization.

20103509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 20103509 is about 4483.6936782077. The cubic root of 20103509 is about 271.9092338800.

The spelling of 20103509 in words is "twenty million, one hundred three thousand, five hundred nine".