20896947073 has 4 divisors (see below), whose sum is σ = 20898904788. Its totient is φ = 20894989360.

The previous prime is 20896947067. The next prime is 20896947103. The reversal of 20896947073 is 37074969802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11801128689 + 9095818384 = 108633^2 + 95372^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20896947073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20896947373) 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 3 ways as a sum of consecutive naturals, for example, 962758 + ... + 984223.

It is an arithmetic number, because the mean of its divisors is an integer number (5224726197).

Almost surely, 2^20896947073 is an apocalyptic number.

It is an amenable number.

20896947073 is a deficient number, since it is larger than the sum of its proper divisors (1957715).

20896947073 is a wasteful number, since it uses less digits than its factorization.

20896947073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1957714.

The product of its (nonzero) digits is 4572288, while the sum is 55.

The spelling of 20896947073 in words is "twenty billion, eight hundred ninety-six million, nine hundred forty-seven thousand, seventy-three".