20665734224 has 10 divisors (see below), whose sum is σ = 40039860090. Its totient is φ = 10332867104.

The previous prime is 20665734113. The next prime is 20665734239. The reversal of 20665734224 is 42243756602.

It can be written as a sum of positive squares in only one way, i.e., 15959774224 + 4705960000 = 126332^2 + 68600^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645804179 + ... + 645804210.

It is an arithmetic number, because the mean of its divisors is an integer number (4003986009).

Almost surely, 2^20665734224 is an apocalyptic number.

It is an amenable number.

20665734224 is a deficient number, since it is larger than the sum of its proper divisors (19374125866).

20665734224 is a wasteful number, since it uses less digits than its factorization.

20665734224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1291608397 (or 1291608391 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 41.

The spelling of 20665734224 in words is "twenty billion, six hundred sixty-five million, seven hundred thirty-four thousand, two hundred twenty-four".