20646684115 has 16 divisors (see below), whose sum is σ = 26338252320. Its totient is φ = 15493075200.

The previous prime is 20646684103. The next prime is 20646684119. The reversal of 20646684115 is 51148664602.

It is not a de Polignac number, because 20646684115 - 2⁷ = 20646683987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20646684119) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1066314 + ... + 1085503.

It is an arithmetic number, because the mean of its divisors is an integer number (1646140770).

Almost surely, 2^20646684115 is an apocalyptic number.

20646684115 is a deficient number, since it is larger than the sum of its proper divisors (5691568205).

20646684115 is a wasteful number, since it uses less digits than its factorization.

20646684115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2151942.

The product of its (nonzero) digits is 276480, while the sum is 43.

The spelling of 20646684115 in words is "twenty billion, six hundred forty-six million, six hundred eighty-four thousand, one hundred fifteen".