20686704478115 has 16 divisors (see below), whose sum is σ = 26734272096000. Its totient is φ = 15275944317312.

The previous prime is 20686704478087. The next prime is 20686704478177. The reversal of 20686704478115 is 51187440768602.

It is a cyclic number.

It is not a de Polignac number, because 20686704478115 - 2¹⁰ = 20686704477091 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1506515 + ... + 6606284.

It is an arithmetic number, because the mean of its divisors is an integer number (1670892006000).

Almost surely, 2^{20686704478115} is an apocalyptic number.

20686704478115 is a deficient number, since it is larger than the sum of its proper divisors (6047567617885).

20686704478115 is a wasteful number, since it uses less digits than its factorization.

20686704478115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8152046.

The product of its (nonzero) digits is 18063360, while the sum is 59.

The spelling of 20686704478115 in words is "twenty trillion, six hundred eighty-six billion, seven hundred four million, four hundred seventy-eight thousand, one hundred fifteen".