20123969 has 4 divisors (see below), whose sum is σ = 20176896. Its totient is φ = 20071044.

The previous prime is 20123959. The next prime is 20124007. The reversal of 20123969 is 96932102.

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 20123969 - 2⁸ = 20123713 is a prime.

It is a super-2 number, since 2×20123969² = 809948256625922, 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 (20123959) 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, 25889 + ... + 26654.

It is an arithmetic number, because the mean of its divisors is an integer number (5044224).

Almost surely, 2^20123969 is an apocalyptic number.

It is an amenable number.

20123969 is a deficient number, since it is larger than the sum of its proper divisors (52927).

20123969 is an equidigital number, since it uses as much as digits as its factorization.

20123969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52926.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 20123969 is about 4485.9746989924. The cubic root of 20123969 is about 272.0014462510.

The spelling of 20123969 in words is "twenty million, one hundred twenty-three thousand, nine hundred sixty-nine".