20660612644 has 27 divisors (see below), whose sum is σ = 42063201243. Its totient is φ = 8853685848.

The previous prime is 20660612629. The next prime is 20660612647. The reversal of 20660612644 is 44621606602.

The square root of 20660612644 is 143738.

It is a perfect power (a square), and thus also a powerful number.

It is not an unprimeable number, because it can be changed into a prime (20660612647) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2007199 + ... + 2017465.

Almost surely, 2^20660612644 is an apocalyptic number.

20660612644 is the 143738-th square number.

It is an amenable number.

20660612644 is an abundant number, since it is smaller than the sum of its proper divisors (21402588599).

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

20660612644 is an frugal number, since it uses more digits than its factorization.

20660612644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20552 (or 10276 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 37.

The spelling of 20660612644 in words is "twenty billion, six hundred sixty million, six hundred twelve thousand, six hundred forty-four".