20912923 has 2 divisors, whose sum is σ = 20912924. Its totient is φ = 20912922.

The previous prime is 20912917. The next prime is 20912989. The reversal of 20912923 is 32921902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20912923 - 2⁵ = 20912891 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20912891 and 20912900.

It is not a weakly prime, because it can be changed into another prime (20912123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10456461 + 10456462.

It is an arithmetic number, because the mean of its divisors is an integer number (10456462).

Almost surely, 2^20912923 is an apocalyptic number.

20912923 is a deficient number, since it is larger than the sum of its proper divisors (1).

20912923 is an equidigital number, since it uses as much as digits as its factorization.

20912923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 20912923 is about 4573.0649459635. The cubic root of 20912923 is about 275.5105578610.

The spelling of 20912923 in words is "twenty million, nine hundred twelve thousand, nine hundred twenty-three".