20734664 has 16 divisors (see below), whose sum is σ = 38978700. Its totient is φ = 10340352.

The previous prime is 20734663. The next prime is 20734667. The reversal of 20734664 is 46643702.

It can be written as a sum of positive squares in 2 ways, for example, as 20160100 + 574564 = 4490^2 + 758^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20734664.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20734663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104 + ... + 6440.

Almost surely, 2^20734664 is an apocalyptic number.

It is an amenable number.

20734664 is a deficient number, since it is larger than the sum of its proper divisors (18244036).

20734664 is a wasteful number, since it uses less digits than its factorization.

20734664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6752 (or 6748 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 32.

The square root of 20734664 is about 4553.5331337325. The cubic root of 20734664 is about 274.7255178614.

The spelling of 20734664 in words is "twenty million, seven hundred thirty-four thousand, six hundred sixty-four".