20665530006 has 128 divisors (see below), whose sum is σ = 48906547200. Its totient is φ = 5753151360.

The previous prime is 20665530001. The next prime is 20665530029. The reversal of 20665530006 is 60003556602.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20665530001) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19440231 + ... + 19441293.

It is an arithmetic number, because the mean of its divisors is an integer number (382082400).

Almost surely, 2^20665530006 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20665530006, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24453273600).

20665530006 is an abundant number, since it is smaller than the sum of its proper divisors (28241017194).

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

20665530006 is a wasteful number, since it uses less digits than its factorization.

20665530006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1554.

The product of its (nonzero) digits is 32400, while the sum is 33.

The spelling of 20665530006 in words is "twenty billion, six hundred sixty-five million, five hundred thirty thousand, six".