20634136619 has 2 divisors, whose sum is σ = 20634136620. Its totient is φ = 20634136618.

The previous prime is 20634136603. The next prime is 20634136643. The reversal of 20634136619 is 91663143602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20634136619 - 2⁴ = 20634136603 is a prime.

It is a super-2 number, since 2×20634136619² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20634136669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10317068309 + 10317068310.

It is an arithmetic number, because the mean of its divisors is an integer number (10317068310).

Almost surely, 2^20634136619 is an apocalyptic number.

20634136619 is a deficient number, since it is larger than the sum of its proper divisors (1).

20634136619 is an equidigital number, since it uses as much as digits as its factorization.

20634136619 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 41.

The spelling of 20634136619 in words is "twenty billion, six hundred thirty-four million, one hundred thirty-six thousand, six hundred nineteen".