20664006642444 has 48 divisors (see below), whose sum is σ = 54020892070656. Its totient is φ = 6092581809600.

The previous prime is 20664006642443. The next prime is 20664006642469. The reversal of 20664006642444 is 44424660046602.

It is a junction number, because it is equal to n+sod(n) for n = 20664006642393 and 20664006642402.

It is not an unprimeable number, because it can be changed into a prime (20664006642443) 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, 2115474912 + ... + 2115484679.

It is an arithmetic number, because the mean of its divisors is an integer number (1125435251472).

Almost surely, 2^{20664006642444} is an apocalyptic number.

It is an amenable number.

20664006642444 is an abundant number, since it is smaller than the sum of its proper divisors (33356885428212).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20664006642444 is a wasteful number, since it uses less digits than its factorization.

20664006642444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4230959646 (or 4230959644 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 48.

The spelling of 20664006642444 in words is "twenty trillion, six hundred sixty-four billion, six million, six hundred forty-two thousand, four hundred forty-four".