20355336666 has 96 divisors (see below), whose sum is σ = 53902920960. Its totient is φ = 5673931200.

The previous prime is 20355336647. The next prime is 20355336679. The reversal of 20355336666 is 66663355302.

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 47 ways as a sum of consecutive naturals, for example, 14671 + ... + 202301.

It is an arithmetic number, because the mean of its divisors is an integer number (561488760).

Almost surely, 2^20355336666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20355336666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26951460480).

20355336666 is an abundant number, since it is smaller than the sum of its proper divisors (33547584294).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20355336666 is a wasteful number, since it uses less digits than its factorization.

20355336666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187697 (or 187684 counting only the distinct ones).

The product of its (nonzero) digits is 1749600, while the sum is 45.

The spelling of 20355336666 in words is "twenty billion, three hundred fifty-five million, three hundred thirty-six thousand, six hundred sixty-six".