20345355355555 has 4 divisors (see below), whose sum is σ = 24414426426672. Its totient is φ = 16276284284440.

The previous prime is 20345355355543. The next prime is 20345355355631. The reversal of 20345355355555 is 55555355354302.

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

It is not a de Polignac number, because 20345355355555 - 2²⁹ = 20344818484643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20345355355496 and 20345355355505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2034535535551 + ... + 2034535535560.

It is an arithmetic number, because the mean of its divisors is an integer number (6103606606668).

Almost surely, 2^{20345355355555} is an apocalyptic number.

20345355355555 is a deficient number, since it is larger than the sum of its proper divisors (4069071071117).

20345355355555 is an equidigital number, since it uses as much as digits as its factorization.

20345355355555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4069071071116.

The product of its (nonzero) digits is 84375000, while the sum is 55.

It can be divided in two parts, 2034535 and 5355555, that added together give a triangular number (7390090 = T₃₈₄₄).

The spelling of 20345355355555 in words is "twenty trillion, three hundred forty-five billion, three hundred fifty-five million, three hundred fifty-five thousand, five hundred fifty-five".