20666605032 has 160 divisors (see below), whose sum is σ = 59223522600. Its totient is φ = 6730753536.

The previous prime is 20666605021. The next prime is 20666605097. The reversal of 20666605032 is 23050666602.

It can be written as a sum of positive squares in 4 ways, for example, as 17775822276 + 2890782756 = 133326^2 + 53766^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 9237418 + ... + 9239654.

Almost surely, 2^20666605032 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20666605032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29611761300).

20666605032 is an abundant number, since it is smaller than the sum of its proper divisors (38556917568).

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

20666605032 is a wasteful number, since it uses less digits than its factorization.

20666605032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2577 (or 2564 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The spelling of 20666605032 in words is "twenty billion, six hundred sixty-six million, six hundred five thousand, thirty-two".