20723664169 has 16 divisors (see below), whose sum is σ = 22550819200. Its totient is φ = 18930070656.

The previous prime is 20723664163. The next prime is 20723664229. The reversal of 20723664169 is 96146632702.

It is a cyclic number.

It is not a de Polignac number, because 20723664169 - 2⁹ = 20723663657 is a prime.

It is a super-2 number, since 2×20723664169² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20723664163) 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, 2149642 + ... + 2159260.

It is an arithmetic number, because the mean of its divisors is an integer number (1409426200).

Almost surely, 2^20723664169 is an apocalyptic number.

It is an amenable number.

20723664169 is a deficient number, since it is larger than the sum of its proper divisors (1827155031).

20723664169 is a wasteful number, since it uses less digits than its factorization.

20723664169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11344.

The product of its (nonzero) digits is 653184, while the sum is 46.

The spelling of 20723664169 in words is "twenty billion, seven hundred twenty-three million, six hundred sixty-four thousand, one hundred sixty-nine".