20205409103559 has 16 divisors (see below), whose sum is σ = 30058146639840. Its totient is φ = 13414379483520.

The previous prime is 20205409103533. The next prime is 20205409103599. The reversal of 20205409103559 is 95530190450202.

20205409103559 is a `hidden beast` number, since 2 + 0 + 2 + 0 + 5 + 4 + 0 + 91 + 0 + 3 + 559 = 666.

It is not a de Polignac number, because 20205409103559 - 2⁸ = 20205409103303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20205409103599) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1552583712 + ... + 1552596725.

It is an arithmetic number, because the mean of its divisors is an integer number (1878634164990).

Almost surely, 2^{20205409103559} is an apocalyptic number.

20205409103559 is a deficient number, since it is larger than the sum of its proper divisors (9852737536281).

20205409103559 is a wasteful number, since it uses less digits than its factorization.

20205409103559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3105180687 (or 3105180681 counting only the distinct ones).

The product of its (nonzero) digits is 486000, while the sum is 45.

The spelling of 20205409103559 in words is "twenty trillion, two hundred five billion, four hundred nine million, one hundred three thousand, five hundred fifty-nine".