20389829 has 2 divisors, whose sum is σ = 20389830. Its totient is φ = 20389828.

The previous prime is 20389819. The next prime is 20389843. The reversal of 20389829 is 92898302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20340100 + 49729 = 4510^2 + 223^2 .

It is a cyclic number.

It is not a de Polignac number, because 20389829 - 2²⁰ = 19341253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20389819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10194914 + 10194915.

It is an arithmetic number, because the mean of its divisors is an integer number (10194915).

Almost surely, 2^20389829 is an apocalyptic number.

It is an amenable number.

20389829 is a deficient number, since it is larger than the sum of its proper divisors (1).

20389829 is an equidigital number, since it uses as much as digits as its factorization.

20389829 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 20389829 is about 4515.5098272510. The cubic root of 20389829 is about 273.1940236297.

The spelling of 20389829 in words is "twenty million, three hundred eighty-nine thousand, eight hundred twenty-nine".