20736129939787 has 2 divisors, whose sum is σ = 20736129939788. Its totient is φ = 20736129939786.

The previous prime is 20736129939671. The next prime is 20736129939823. The reversal of 20736129939787 is 78793992163702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20736129939787 - 2¹⁹ = 20736129415499 is a prime.

It is not a weakly prime, because it can be changed into another prime (20736129979787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10368064969893 + 10368064969894.

It is an arithmetic number, because the mean of its divisors is an integer number (10368064969894).

Almost surely, 2^{20736129939787} is an apocalyptic number.

20736129939787 is a deficient number, since it is larger than the sum of its proper divisors (1).

20736129939787 is an equidigital number, since it uses as much as digits as its factorization.

20736129939787 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432081216, while the sum is 73.

The spelling of 20736129939787 in words is "twenty trillion, seven hundred thirty-six billion, one hundred twenty-nine million, nine hundred thirty-nine thousand, seven hundred eighty-seven".