20210923 has 2 divisors, whose sum is σ = 20210924. Its totient is φ = 20210922.

The previous prime is 20210899. The next prime is 20210929. The reversal of 20210923 is 32901202.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20210923 - 2⁵ = 20210891 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20210923.

It is not a weakly prime, because it can be changed into another prime (20210929) 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 as a sum of consecutive naturals, namely, 10105461 + 10105462.

It is an arithmetic number, because the mean of its divisors is an integer number (10105462).

Almost surely, 2^20210923 is an apocalyptic number.

20210923 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210923 is an equidigital number, since it uses as much as digits as its factorization.

20210923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 20210923 is about 4495.6560144210. The cubic root of 20210923 is about 272.3926485654.

The spelling of 20210923 in words is "twenty million, two hundred ten thousand, nine hundred twenty-three".