20969923 has 8 divisors (see below), whose sum is σ = 22808016. Its totient is φ = 19164000.

The previous prime is 20969903. The next prime is 20969953. The reversal of 20969923 is 32996902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20969923 - 2⁹ = 20969411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20969903) 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 7 ways as a sum of consecutive naturals, for example, 6673 + ... + 9298.

It is an arithmetic number, because the mean of its divisors is an integer number (2851002).

Almost surely, 2^20969923 is an apocalyptic number.

20969923 is a deficient number, since it is larger than the sum of its proper divisors (1838093).

20969923 is a wasteful number, since it uses less digits than its factorization.

20969923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16085.

The product of its (nonzero) digits is 52488, while the sum is 40.

The square root of 20969923 is about 4579.2928493382. The cubic root of 20969923 is about 275.7606401623.

The spelling of 20969923 in words is "twenty million, nine hundred sixty-nine thousand, nine hundred twenty-three".