20786805473 has 16 divisors (see below), whose sum is σ = 24855764736. Its totient is φ = 16996858560.

The previous prime is 20786805421. The next prime is 20786805497. The reversal of 20786805473 is 37450868702.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20786805473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20786805073) 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, 113018 + ... + 233123.

It is an arithmetic number, because the mean of its divisors is an integer number (1553485296).

Almost surely, 2^20786805473 is an apocalyptic number.

20786805473 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20786805473 is a deficient number, since it is larger than the sum of its proper divisors (4068959263).

20786805473 is a wasteful number, since it uses less digits than its factorization.

20786805473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346544.

The product of its (nonzero) digits is 2257920, while the sum is 50.

The spelling of 20786805473 in words is "twenty billion, seven hundred eighty-six million, eight hundred five thousand, four hundred seventy-three".