20669142956668 has 48 divisors (see below), whose sum is σ = 36393335193600. Its totient is φ = 10271213971200.

The previous prime is 20669142956629. The next prime is 20669142956753. The reversal of 20669142956668 is 86665924196602.

It is a junction number, because it is equal to n+sod(n) for n = 20669142956597 and 20669142956606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1715417908 + ... + 1715429956.

It is an arithmetic number, because the mean of its divisors is an integer number (758194483200).

Almost surely, 2^{20669142956668} is an apocalyptic number.

It is an amenable number.

20669142956668 is a deficient number, since it is larger than the sum of its proper divisors (15724192236932).

20669142956668 is a wasteful number, since it uses less digits than its factorization.

20669142956668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15298 (or 15296 counting only the distinct ones).

The product of its (nonzero) digits is 403107840, while the sum is 70.

The spelling of 20669142956668 in words is "twenty trillion, six hundred sixty-nine billion, one hundred forty-two million, nine hundred fifty-six thousand, six hundred sixty-eight".