20979663213 has 8 divisors (see below), whose sum is σ = 27978007968. Its totient is φ = 13983880304.

The previous prime is 20979663193. The next prime is 20979663269. The reversal of 20979663213 is 31236697902.

It is a happy number.

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 20979663213 - 2¹² = 20979659117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20979653213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 621270 + ... + 654167.

It is an arithmetic number, because the mean of its divisors is an integer number (3497250996).

Almost surely, 2^20979663213 is an apocalyptic number.

It is an amenable number.

20979663213 is a deficient number, since it is larger than the sum of its proper divisors (6998344755).

20979663213 is a wasteful number, since it uses less digits than its factorization.

20979663213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280923.

The product of its (nonzero) digits is 734832, while the sum is 48.

The spelling of 20979663213 in words is "twenty billion, nine hundred seventy-nine million, six hundred sixty-three thousand, two hundred thirteen".