20406165066 has 96 divisors (see below), whose sum is σ = 51002235648. Its totient is φ = 5776012800.

The previous prime is 20406164957. The next prime is 20406165071. The reversal of 20406165066 is 66056160402.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20406165066.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8237020 + ... + 8239496.

It is an arithmetic number, because the mean of its divisors is an integer number (531273288).

Almost surely, 2^20406165066 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20406165066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25501117824).

20406165066 is an abundant number, since it is smaller than the sum of its proper divisors (30596070582).

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

20406165066 is a wasteful number, since it uses less digits than its factorization.

20406165066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3076 (or 3073 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 20406165066 in words is "twenty billion, four hundred six million, one hundred sixty-five thousand, sixty-six".