20104533666 has 128 divisors (see below), whose sum is σ = 52269649920. Its totient is φ = 5609520000.

The previous prime is 20104533661. The next prime is 20104533719. The reversal of 20104533666 is 66633540102.

It is a super-3 number, since 3×20104533666³ (a number of 32 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20104533666.

It is not an unprimeable number, because it can be changed into a prime (20104533661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2868166 + ... + 2875166.

It is an arithmetic number, because the mean of its divisors is an integer number (408356640).

Almost surely, 2^20104533666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20104533666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26134824960).

20104533666 is an abundant number, since it is smaller than the sum of its proper divisors (32165116254).

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

20104533666 is a wasteful number, since it uses less digits than its factorization.

20104533666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7197 (or 7191 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The spelling of 20104533666 in words is "twenty billion, one hundred four million, five hundred thirty-three thousand, six hundred sixty-six".