20615346066 has 64 divisors (see below), whose sum is σ = 49650923520. Its totient is φ = 5574458880.

The previous prime is 20615346061. The next prime is 20615346107. The reversal of 20615346066 is 66064351602.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20615346061) 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 31 ways as a sum of consecutive naturals, for example, 810210 + ... + 835266.

It is an arithmetic number, because the mean of its divisors is an integer number (775795680).

Almost surely, 2^20615346066 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20615346066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24825461760).

20615346066 is an abundant number, since it is smaller than the sum of its proper divisors (29035577454).

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

20615346066 is a wasteful number, since it uses less digits than its factorization.

20615346066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26119.

The product of its (nonzero) digits is 155520, while the sum is 39.

Adding to 20615346066 its reverse (66064351602), we get a palindrome (86679697668).

The spelling of 20615346066 in words is "twenty billion, six hundred fifteen million, three hundred forty-six thousand, sixty-six".