20669362709 has 4 divisors (see below), whose sum is σ = 20669851104. Its totient is φ = 20668874316.

The previous prime is 20669362699. The next prime is 20669362723. The reversal of 20669362709 is 90726396602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20669362709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20669361709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173987 + ... + 267600.

It is an arithmetic number, because the mean of its divisors is an integer number (5167462776).

Almost surely, 2^20669362709 is an apocalyptic number.

It is an amenable number.

20669362709 is a deficient number, since it is larger than the sum of its proper divisors (488395).

20669362709 is an equidigital number, since it uses as much as digits as its factorization.

20669362709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488394.

The product of its (nonzero) digits is 1469664, while the sum is 50.

The spelling of 20669362709 in words is "twenty billion, six hundred sixty-nine million, three hundred sixty-two thousand, seven hundred nine".