20806533464 has 16 divisors (see below), whose sum is σ = 39069885600. Its totient is φ = 10387897312.

The previous prime is 20806533421. The next prime is 20806533467. The reversal of 20806533464 is 46433560802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20806533467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1915424 + ... + 1926255.

It is an arithmetic number, because the mean of its divisors is an integer number (2441867850).

Almost surely, 2^20806533464 is an apocalyptic number.

It is an amenable number.

20806533464 is a deficient number, since it is larger than the sum of its proper divisors (18263352136).

20806533464 is a wasteful number, since it uses less digits than its factorization.

20806533464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3842362 (or 3842358 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 41.

The spelling of 20806533464 in words is "twenty billion, eight hundred six million, five hundred thirty-three thousand, four hundred sixty-four".