20916928463 has 4 divisors (see below), whose sum is σ = 20920162368. Its totient is φ = 20913694560.

The previous prime is 20916928451. The next prime is 20916928477. The reversal of 20916928463 is 36482961902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36482961902 = 2 ⋅18241480951.

It is a cyclic number.

It is not a de Polignac number, because 20916928463 - 2⁴ = 20916928447 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 (20916924463) 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, 1607231 + ... + 1620192.

It is an arithmetic number, because the mean of its divisors is an integer number (5230040592).

Almost surely, 2^20916928463 is an apocalyptic number.

20916928463 is a deficient number, since it is larger than the sum of its proper divisors (3233905).

20916928463 is an equidigital number, since it uses as much as digits as its factorization.

20916928463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3233904.

The product of its (nonzero) digits is 1119744, while the sum is 50.

The spelling of 20916928463 in words is "twenty billion, nine hundred sixteen million, nine hundred twenty-eight thousand, four hundred sixty-three".