20673229 has 2 divisors, whose sum is σ = 20673230. Its totient is φ = 20673228.

The previous prime is 20673227. The next prime is 20673253. The reversal of 20673229 is 92237602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19669225 + 1004004 = 4435^2 + 1002^2 .

It is a cyclic number.

It is not a de Polignac number, because 20673229 - 2¹ = 20673227 is a prime.

Together with 20673227, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20673229.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20673227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10336614 + 10336615.

It is an arithmetic number, because the mean of its divisors is an integer number (10336615).

Almost surely, 2^20673229 is an apocalyptic number.

It is an amenable number.

20673229 is a deficient number, since it is larger than the sum of its proper divisors (1).

20673229 is an equidigital number, since it uses as much as digits as its factorization.

20673229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 20673229 is about 4546.7822688138. The cubic root of 20673229 is about 274.4539201994.

It can be divided in two parts, 20673 and 229, that added together give a palindrome (20902).

The spelling of 20673229 in words is "twenty million, six hundred seventy-three thousand, two hundred twenty-nine".