20103540605 has 4 divisors (see below), whose sum is σ = 24124248732. Its totient is φ = 16082832480.

The previous prime is 20103540593. The next prime is 20103540647. The reversal of 20103540605 is 50604530102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3869213209 + 16234327396 = 62203^2 + 127414^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20103540605 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2010354056 + ... + 2010354065.

It is an arithmetic number, because the mean of its divisors is an integer number (6031062183).

Almost surely, 2^20103540605 is an apocalyptic number.

It is an amenable number.

20103540605 is a deficient number, since it is larger than the sum of its proper divisors (4020708127).

20103540605 is an equidigital number, since it uses as much as digits as its factorization.

20103540605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4020708126.

The product of its (nonzero) digits is 3600, while the sum is 26.

The spelling of 20103540605 in words is "twenty billion, one hundred three million, five hundred forty thousand, six hundred five".