20939976303647 has 8 divisors (see below), whose sum is σ = 20993416481616. Its totient is φ = 20886539617152.

The previous prime is 20939976303619. The next prime is 20939976303661. The reversal of 20939976303647 is 74630367993902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20939976303647 - 2¹² = 20939976299551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20939976303347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11355623 + ... + 13070199.

It is an arithmetic number, because the mean of its divisors is an integer number (2624177060202).

Almost surely, 2^{20939976303647} is an apocalyptic number.

20939976303647 is a deficient number, since it is larger than the sum of its proper divisors (53440177969).

20939976303647 is a wasteful number, since it uses less digits than its factorization.

20939976303647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1745737.

The product of its (nonzero) digits is 277766496, while the sum is 68.

The spelling of 20939976303647 in words is "twenty trillion, nine hundred thirty-nine billion, nine hundred seventy-six million, three hundred three thousand, six hundred forty-seven".