20665366016 has 20 divisors (see below), whose sum is σ = 41290371012. Its totient is φ = 10332682752.

The previous prime is 20665366013. The next prime is 20665366031. The reversal of 20665366016 is 61066356602.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20665366013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20180510 + ... + 20181533.

Almost surely, 2^20665366016 is an apocalyptic number.

It is an amenable number.

20665366016 is a deficient number, since it is larger than the sum of its proper divisors (20625004996).

20665366016 is an frugal number, since it uses more digits than its factorization.

20665366016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40362061 (or 40362045 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 41.

The spelling of 20665366016 in words is "twenty billion, six hundred sixty-five million, three hundred sixty-six thousand, sixteen".