20085423829 has 2 divisors, whose sum is σ = 20085423830. Its totient is φ = 20085423828.

The previous prime is 20085423679. The next prime is 20085423851. The reversal of 20085423829 is 92832458002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19481738929 + 603684900 = 139577^2 + 24570^2 .

It is a cyclic number.

It is not a de Polignac number, because 20085423829 - 2²⁹ = 19548552917 is a prime.

It is a super-2 number, since 2×20085423829² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20085823829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10042711914 + 10042711915.

It is an arithmetic number, because the mean of its divisors is an integer number (10042711915).

Almost surely, 2^20085423829 is an apocalyptic number.

It is an amenable number.

20085423829 is a deficient number, since it is larger than the sum of its proper divisors (1).

20085423829 is an equidigital number, since it uses as much as digits as its factorization.

20085423829 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 276480, while the sum is 43.

The spelling of 20085423829 in words is "twenty billion, eighty-five million, four hundred twenty-three thousand, eight hundred twenty-nine".