20956326169 has 3 divisors (see below), whose sum is σ = 20956470933. Its totient is φ = 20956181406.

The previous prime is 20956326163. The next prime is 20956326199. The reversal of 20956326169 is 96162365902.

It is a happy number.

The square root of 20956326169 is 144763.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 20956326169 - 2⁵ = 20956326137 is a prime.

It is a super-2 number, since 2×20956326169² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20956326163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 72382 + ... + 217144.

It is an arithmetic number, because the mean of its divisors is an integer number (6985490311).

Almost surely, 2^20956326169 is an apocalyptic number.

20956326169 is the 144763-rd square number.

20956326169 is the 72382-nd centered octagonal number.

It is an amenable number.

20956326169 is a deficient number, since it is larger than the sum of its proper divisors (144764).

20956326169 is an frugal number, since it uses more digits than its factorization.

20956326169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289526 (or 144763 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 49.

Multiplying 20956326169 by its sum of digits (49), we get a square (1026859982281 = 1013341²).

The spelling of 20956326169 in words is "twenty billion, nine hundred fifty-six million, three hundred twenty-six thousand, one hundred sixty-nine".