20665084799644 has 12 divisors (see below), whose sum is σ = 36173733589224. Its totient is φ = 10329732345584.

The previous prime is 20665084799633. The next prime is 20665084799659. The reversal of 20665084799644 is 44699748056602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 702497014 + ... + 702526429.

It is an arithmetic number, because the mean of its divisors is an integer number (3014477799102).

Almost surely, 2^{20665084799644} is an apocalyptic number.

It is an amenable number.

20665084799644 is a deficient number, since it is larger than the sum of its proper divisors (15508648789580).

20665084799644 is a wasteful number, since it uses less digits than its factorization.

20665084799644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1405027124 (or 1405027122 counting only the distinct ones).

The product of its (nonzero) digits is 627056640, while the sum is 70.

The spelling of 20665084799644 in words is "twenty trillion, six hundred sixty-five billion, eighty-four million, seven hundred ninety-nine thousand, six hundred forty-four".