20665210601 has 16 divisors (see below), whose sum is σ = 24438412800. Its totient is φ = 17097597888.

The previous prime is 20665210589. The next prime is 20665210649. The reversal of 20665210601 is 10601256602.

It is not a de Polignac number, because 20665210601 - 2⁶ = 20665210537 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20665210681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 876080 + ... + 899358.

It is an arithmetic number, because the mean of its divisors is an integer number (1527400800).

Almost surely, 2^20665210601 is an apocalyptic number.

It is an amenable number.

20665210601 is a deficient number, since it is larger than the sum of its proper divisors (3773202199).

20665210601 is a wasteful number, since it uses less digits than its factorization.

20665210601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27688.

The product of its (nonzero) digits is 4320, while the sum is 29.

The spelling of 20665210601 in words is "twenty billion, six hundred sixty-five million, two hundred ten thousand, six hundred one".