20686433774438 has 16 divisors (see below), whose sum is σ = 32380231873536. Its totient is φ = 9893063871240.

The previous prime is 20686433774431. The next prime is 20686433774467. The reversal of 20686433774438 is 83447733468602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20686433774431) 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 in 7 ways as a sum of consecutive naturals, for example, 9152156 + ... + 11186367.

It is an arithmetic number, because the mean of its divisors is an integer number (2023764492096).

Almost surely, 2^{20686433774438} is an apocalyptic number.

20686433774438 is a deficient number, since it is larger than the sum of its proper divisors (11693798099098).

20686433774438 is a wasteful number, since it uses less digits than its factorization.

20686433774438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20360659.

The product of its (nonzero) digits is 390168576, while the sum is 65.

The spelling of 20686433774438 in words is "twenty trillion, six hundred eighty-six billion, four hundred thirty-three million, seven hundred seventy-four thousand, four hundred thirty-eight".