20686704478225 has 24 divisors (see below), whose sum is σ = 25724550094848. Its totient is φ = 16502254262400.

The previous prime is 20686704478213. The next prime is 20686704478277. The reversal of 20686704478225 is 52287440768602.

It is a happy number.

It is not a de Polignac number, because 20686704478225 - 2¹¹ = 20686704476177 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 23 ways as a sum of consecutive naturals, for example, 77367765 + ... + 77634685.

It is an arithmetic number, because the mean of its divisors is an integer number (1071856253952).

Almost surely, 2^{20686704478225} is an apocalyptic number.

20686704478225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20686704478225 is a deficient number, since it is larger than the sum of its proper divisors (5037845616623).

20686704478225 is a wasteful number, since it uses less digits than its factorization.

20686704478225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275745 (or 275740 counting only the distinct ones).

The product of its (nonzero) digits is 72253440, while the sum is 61.

The spelling of 20686704478225 in words is "twenty trillion, six hundred eighty-six billion, seven hundred four million, four hundred seventy-eight thousand, two hundred twenty-five".