20729769919 has 2 divisors, whose sum is σ = 20729769920. Its totient is φ = 20729769918.

The previous prime is 20729769913. The next prime is 20729769997. The reversal of 20729769919 is 91996792702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20729769919 - 2³ = 20729769911 is a prime.

It is a super-2 number, since 2×20729769919² (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 (20729769911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10364884959 + 10364884960.

It is an arithmetic number, because the mean of its divisors is an integer number (10364884960).

Almost surely, 2^20729769919 is an apocalyptic number.

20729769919 is a deficient number, since it is larger than the sum of its proper divisors (1).

20729769919 is an equidigital number, since it uses as much as digits as its factorization.

20729769919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7715736, while the sum is 61.

The spelling of 20729769919 in words is "twenty billion, seven hundred twenty-nine million, seven hundred sixty-nine thousand, nine hundred nineteen".