20829229 has 2 divisors, whose sum is σ = 20829230. Its totient is φ = 20829228.

The previous prime is 20829227. The next prime is 20829239. The reversal of 20829229 is 92292802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18275625 + 2553604 = 4275^2 + 1598^2 .

It is a cyclic number.

It is not a de Polignac number, because 20829229 - 2¹ = 20829227 is a prime.

Together with 20829227, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20829194 and 20829203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20829223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10414614 + 10414615.

It is an arithmetic number, because the mean of its divisors is an integer number (10414615).

Almost surely, 2^20829229 is an apocalyptic number.

It is an amenable number.

20829229 is a deficient number, since it is larger than the sum of its proper divisors (1).

20829229 is an equidigital number, since it uses as much as digits as its factorization.

20829229 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 34.

The square root of 20829229 is about 4563.9050165401. The cubic root of 20829229 is about 275.1425332744.

It can be divided in two parts, 2082 and 9229, that added together give a palindrome (11311).

The spelling of 20829229 in words is "twenty million, eight hundred twenty-nine thousand, two hundred twenty-nine".