20683656683657 has 16 divisors (see below), whose sum is σ = 22778582925312. Its totient is φ = 18624553416720.

The previous prime is 20683656683653. The next prime is 20683656683663. The reversal of 20683656683657 is 75638665638602.

It is a cyclic number.

It is not a de Polignac number, because 20683656683657 - 2² = 20683656683653 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20683656683653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5799968 + ... + 8660654.

It is an arithmetic number, because the mean of its divisors is an integer number (1423661432832).

Almost surely, 2^{20683656683657} is an apocalyptic number.

It is an amenable number.

20683656683657 is a deficient number, since it is larger than the sum of its proper divisors (2094926241655).

20683656683657 is a wasteful number, since it uses less digits than its factorization.

20683656683657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2866948.

The product of its (nonzero) digits is 1567641600, while the sum is 71.

The spelling of 20683656683657 in words is "twenty trillion, six hundred eighty-three billion, six hundred fifty-six million, six hundred eighty-three thousand, six hundred fifty-seven".