20512404066 has 128 divisors (see below), whose sum is σ = 53972582400. Its totient is φ = 5035037760.

The previous prime is 20512404053. The next prime is 20512404071. The reversal of 20512404066 is 66040421502.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3850881 + ... + 3856203.

It is an arithmetic number, because the mean of its divisors is an integer number (421660800).

Almost surely, 2^20512404066 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20512404066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26986291200).

20512404066 is an abundant number, since it is smaller than the sum of its proper divisors (33460178334).

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

20512404066 is a wasteful number, since it uses less digits than its factorization.

20512404066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5804.

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 20512404066 its reverse (66040421502), we get a palindrome (86552825568).

The spelling of 20512404066 in words is "twenty billion, five hundred twelve million, four hundred four thousand, sixty-six".