20205566829789 has 16 divisors (see below), whose sum is σ = 30667737798144. Its totient is φ = 11713372074800.

The previous prime is 20205566829703. The next prime is 20205566829821. The reversal of 20205566829789 is 98792866550202.

It is not a de Polignac number, because 20205566829789 - 2⁷ = 20205566829661 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20205566839789) 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, 13310649327 + ... + 13310650844.

It is an arithmetic number, because the mean of its divisors is an integer number (1916733612384).

Almost surely, 2^{20205566829789} is an apocalyptic number.

It is an amenable number.

20205566829789 is a deficient number, since it is larger than the sum of its proper divisors (10462170968355).

20205566829789 is a wasteful number, since it uses less digits than its factorization.

20205566829789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26621300208.

The product of its (nonzero) digits is 261273600, while the sum is 69.

The spelling of 20205566829789 in words is "twenty trillion, two hundred five billion, five hundred sixty-six million, eight hundred twenty-nine thousand, seven hundred eighty-nine".