20968169 has 4 divisors (see below), whose sum is σ = 21028944. Its totient is φ = 20907396.

The previous prime is 20968141. The next prime is 20968177. The reversal of 20968169 is 96186902.

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 not a de Polignac number, because 20968169 - 2¹⁶ = 20902633 is a prime.

It is a super-2 number, since 2×20968169² = 879328222425122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20968109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29867 + ... + 30560.

It is an arithmetic number, because the mean of its divisors is an integer number (5257236).

Almost surely, 2^20968169 is an apocalyptic number.

It is an amenable number.

20968169 is a deficient number, since it is larger than the sum of its proper divisors (60775).

20968169 is an equidigital number, since it uses as much as digits as its factorization.

20968169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60774.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 20968169 is about 4579.1013310474. The cubic root of 20968169 is about 275.7529514097.

The spelling of 20968169 in words is "twenty million, nine hundred sixty-eight thousand, one hundred sixty-nine".