20205015510655 has 4 divisors (see below), whose sum is σ = 24246018612792. Its totient is φ = 16164012408520.

The previous prime is 20205015510653. The next prime is 20205015510817. The reversal of 20205015510655 is 55601551050202.

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

It is not a de Polignac number, because 20205015510655 - 2¹ = 20205015510653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20205015510653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2020501551061 + ... + 2020501551070.

It is an arithmetic number, because the mean of its divisors is an integer number (6061504653198).

Almost surely, 2^{20205015510655} is an apocalyptic number.

20205015510655 is a deficient number, since it is larger than the sum of its proper divisors (4041003102137).

20205015510655 is an equidigital number, since it uses as much as digits as its factorization.

20205015510655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4041003102136.

The product of its (nonzero) digits is 75000, while the sum is 37.

Adding to 20205015510655 its reverse (55601551050202), we get a palindrome (75806566560857).

The spelling of 20205015510655 in words is "twenty trillion, two hundred five billion, fifteen million, five hundred ten thousand, six hundred fifty-five".