20500104636439 has 2 divisors, whose sum is σ = 20500104636440. Its totient is φ = 20500104636438.

The previous prime is 20500104636409. The next prime is 20500104636463. The reversal of 20500104636439 is 93463640100502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20500104636439 - 2²⁹ = 20499567765527 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20500104636395 and 20500104636404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20500104636409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10250052318219 + 10250052318220.

It is an arithmetic number, because the mean of its divisors is an integer number (10250052318220).

Almost surely, 2^{20500104636439} is an apocalyptic number.

20500104636439 is a deficient number, since it is larger than the sum of its proper divisors (1).

20500104636439 is an equidigital number, since it uses as much as digits as its factorization.

20500104636439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 43.

The spelling of 20500104636439 in words is "twenty trillion, five hundred billion, one hundred four million, six hundred thirty-six thousand, four hundred thirty-nine".