20646787419686 has 4 divisors (see below), whose sum is σ = 30970181129532. Its totient is φ = 10323393709842.

The previous prime is 20646787419649. The next prime is 20646787419743. The reversal of 20646787419686 is 68691478764602.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5161696854920 + ... + 5161696854923.

It is an arithmetic number, because the mean of its divisors is an integer number (7742545282383).

Almost surely, 2^{20646787419686} is an apocalyptic number.

20646787419686 is a deficient number, since it is larger than the sum of its proper divisors (10323393709846).

20646787419686 is a wasteful number, since it uses less digits than its factorization.

20646787419686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10323393709845.

The product of its (nonzero) digits is 1170505728, while the sum is 74.

The spelling of 20646787419686 in words is "twenty trillion, six hundred forty-six billion, seven hundred eighty-seven million, four hundred nineteen thousand, six hundred eighty-six".