20103409 has 8 divisors (see below), whose sum is σ = 21033000. Its totient is φ = 19189632.

The previous prime is 20103383. The next prime is 20103427. The reversal of 20103409 is 90430102.

It can be written as a sum of positive squares in 4 ways, for example, as 1587600 + 18515809 = 1260^2 + 4303^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20103409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20103509) 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 in 7 ways as a sum of consecutive naturals, for example, 1314 + ... + 6475.

It is an arithmetic number, because the mean of its divisors is an integer number (2629125).

Almost surely, 2^20103409 is an apocalyptic number.

20103409 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20103409 is a deficient number, since it is larger than the sum of its proper divisors (929591).

20103409 is an equidigital number, since it uses as much as digits as its factorization.

20103409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7907.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 20103409 is about 4483.6825266738. The cubic root of 20103409 is about 271.9087830306.

The spelling of 20103409 in words is "twenty million, one hundred three thousand, four hundred nine".