20959229 has 2 divisors, whose sum is σ = 20959230. Its totient is φ = 20959228.

The previous prime is 20959163. The next prime is 20959231. The reversal of 20959229 is 92295902.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16999129 + 3960100 = 4123^2 + 1990^2 .

It is a cyclic number.

It is not a de Polignac number, because 20959229 - 2¹² = 20955133 is a prime.

Together with 20959231, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20959192 and 20959201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20959429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10479614 + 10479615.

It is an arithmetic number, because the mean of its divisors is an integer number (10479615).

Almost surely, 2^20959229 is an apocalyptic number.

It is an amenable number.

20959229 is a deficient number, since it is larger than the sum of its proper divisors (1).

20959229 is an equidigital number, since it uses as much as digits as its factorization.

20959229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 20959229 is about 4578.1250529010. The cubic root of 20959229 is about 275.7137557789.

The spelling of 20959229 in words is "twenty million, nine hundred fifty-nine thousand, two hundred twenty-nine".