20869223 has 2 divisors, whose sum is σ = 20869224. Its totient is φ = 20869222.

The previous prime is 20869187. The next prime is 20869237. The reversal of 20869223 is 32296802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20869223 - 2⁶ = 20869159 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20869223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20869273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10434611 + 10434612.

It is an arithmetic number, because the mean of its divisors is an integer number (10434612).

Almost surely, 2^20869223 is an apocalyptic number.

20869223 is a deficient number, since it is larger than the sum of its proper divisors (1).

20869223 is an equidigital number, since it uses as much as digits as its factorization.

20869223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 20869223 is about 4568.2844701266. The cubic root of 20869223 is about 275.3185201861.

The spelling of 20869223 in words is "twenty million, eight hundred sixty-nine thousand, two hundred twenty-three".