20206664103643 has 4 divisors (see below), whose sum is σ = 20208032484640. Its totient is φ = 20205295722648.

The previous prime is 20206664103611. The next prime is 20206664103713. The reversal of 20206664103643 is 34630146660202.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20206664103643 - 2⁵ = 20206664103611 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20206664103643.

It is not an unprimeable number, because it can be changed into a prime (20206664103343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 684168348 + ... + 684197881.

It is an arithmetic number, because the mean of its divisors is an integer number (5052008121160).

Almost surely, 2^{20206664103643} is an apocalyptic number.

20206664103643 is a deficient number, since it is larger than the sum of its proper divisors (1368380997).

20206664103643 is a wasteful number, since it uses less digits than its factorization.

20206664103643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368380996.

The product of its (nonzero) digits is 746496, while the sum is 43.

The spelling of 20206664103643 in words is "twenty trillion, two hundred six billion, six hundred sixty-four million, one hundred three thousand, six hundred forty-three".