20300640066 has 160 divisors (see below), whose sum is σ = 55537954560. Its totient is φ = 5410105344.

The previous prime is 20300640047. The next prime is 20300640071. The reversal of 20300640066 is 66004600302.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2173755 + ... + 2183073.

It is an arithmetic number, because the mean of its divisors is an integer number (347112216).

Almost surely, 2^20300640066 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20300640066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27768977280).

20300640066 is an abundant number, since it is smaller than the sum of its proper divisors (35237314494).

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

20300640066 is a wasteful number, since it uses less digits than its factorization.

20300640066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9470 (or 9461 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The spelling of 20300640066 in words is "twenty billion, three hundred million, six hundred forty thousand, sixty-six".