20820008229 has 4 divisors (see below), whose sum is σ = 27760010976. Its totient is φ = 13880005484.

The previous prime is 20820008221. The next prime is 20820008257. The reversal of 20820008229 is 92280002802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20820008229 - 2³ = 20820008221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20820008229.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20820008221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3470001369 + ... + 3470001374.

It is an arithmetic number, because the mean of its divisors is an integer number (6940002744).

Almost surely, 2^20820008229 is an apocalyptic number.

It is an amenable number.

20820008229 is a deficient number, since it is larger than the sum of its proper divisors (6940002747).

20820008229 is an equidigital number, since it uses as much as digits as its factorization.

20820008229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6940002746.

The product of its (nonzero) digits is 9216, while the sum is 33.

The spelling of 20820008229 in words is "twenty billion, eight hundred twenty million, eight thousand, two hundred twenty-nine".